Interesting facts about the human heart
The heart is the muscle in our body that plays the role of a pump and pumps blood through the veins and blood vessels. The number of heart contractions in a person at different ages is not the same. In an adult, the heart contracts per minute on average 72 times, in a one-year-old child – 110 times, and in a newborn 120-140 times. By the way, the fetal heart begins to beat after 4 weeks.
11 interesting facts about the heart.
- On average, the human heart makes 4,200 contractions per hour, 100,800 per day, 36 million 792 thousand per year and about 2.4 billion contractions in the average human 64-year life span.
- For one reduction, a person’s heart ejects an average of 60 milliliters of blood. This amounts to 420 milliliters per minute, more than 25 liters per hour, 600 liters per day, more than 200 thousand liters per year!
- A trained heart is capable of more powerful contractions, has a large reserve power, and works much more economically. Its efficiency is higher. It is reduced less often, and in the intervals between contractions it is better resting and supplied with blood. In an untrained person, during a dormant period, the pulse is approximately 70 beats per minute, while in an athlete in the normal state – 42 beats per minute.
- At the time of the highest voltage, the heart rate can reach 200-250 beats per minute. Within a minute, such a heart can send over 40 liters of blood to the circulatory system.
- Scientists conducted interesting studies at one time over Andrei Novikov, a participant in a hundred-kilometer ski race. They calculated that in 6 hours 22 minutes spent on the competition, his heart pumped about 35 thousand liters of blood, that is, an amount sufficient to fill the railway tank!
- It is curious that the heart weighs less than 500 grams, but at the same time it does enough work in 10 minutes to lift a person weighing 65 kilograms to a height of 10 meters!
- The heart supplies blood to all organs with the exception of the cornea, which is more than 80 trillion cells. Subcutaneous fat makes it difficult for the heart to make blood pump through fatty tissues, which is very difficult.
- In the human heart there are 4 chambers, and the cockroach has as many as 13. It is the heart of the cockroach that formed the basis for creating a new prototype of an artificial heart for humans.
- It is interesting that the male heart is one third larger than the female in weight and size, the male heart weighs an average of 320 g, the female heart – 240 g. For that, the female heart beats more often than the male one.
- At the beginning of the 19th century, the French doctor Rene Laennec constantly received complaints from patients who did not like that he put his ear to his bust, listening to the heartbeat. Then the young doctor invented a stethoscope so as not to embarrass his visitors.
- The first successful heart transplant was made on December 3, 1967 by a South African surgeon Christian Barnard to a patient Louis Washansky. The patient after the operation lived only 18 days
Interesting facts about biceps
The biceps muscle of the shoulder, better known as biceps, is perhaps one of the main signs of “inflated” men. Many novice athletes seek to increase the volume of this particular muscle as quickly as possible. And, meanwhile, in a person of ordinary constitution, the weight of the biceps of the shoulder muscle is only 300-400 g. And in volume – a little more than 30 cm. Although, some bodybuilders achieve impressive sizes. Sometimes – with damage to their own health.
Bodybuilder from the USA Greg Valentino for ten years of “clean” training increased the volume of biceps to 53 centimeters. The result is excellent, but it seemed to Greg that this was not enough. He started taking steroids, after which the athlete’s biceps became huge – 71 cm. It all ended sadly – his famous “super biceps” tore the skin, which led to infection. Greg’s life was saved, but now his hands are “decorated” with numerous scars, and there is no trace of the past volumes.
Frank Staples, a Texas resident, also dreamed of powerful, sculpted biceps, but it was problematic for him to go to the gym; Frank was serving time in a local prison. Then he began to regularly visit the prison library, and, he chose only the most impressive volumes of encyclopedias. It turned out that he not only reads books, but also uses them as dumbbells, wrapping several volumes in a pillowcase. Six months later, the first results appeared: Frank Staples, as a result of hard training, became smarter and stronger.
As a child, the American Larry Scott was incredibly complex because of his thinness. Thin arms were especially embarrassing for the teenager, the volume of biceps on which was far from reaching even the average – only 28 centimeters. Through hard training, the guy was able to pump them up to 54 centimeters, and in 1965 and 1966. won the title “Mr. Olympia”.
It must be remembered that huge biceps are not always an indicator of heroic strength. It is often the opposite. For example, the famous Russian athlete Sergei Eliseev was rightfully considered one of the strongest people in the world in the late XIX – early XX centuries. At the same time, his biceps were not affected by the volume – only 42 centimeters.
The biceps consists of two heads – long and short. With the help of this muscle, a person can bend the arm in the shoulder and elbow joint. Accordingly, with flexion with weights, the biceps begin to increase in volume. Not without reason, Sylvester Stalone said: “Nothing will allow you to feel stronger than powerful biceps, and nothing develops biceps better than bending your arms with a barbell.”
Russian Denis Tsyplenkov managed to bend his arms with a barbell, whose weight was 160 kg. Despite the fact that such exercises help the growth of biceps, they are dangerous for poorly trained athletes and can result in severe trauma, and sometimes lead to disability.
In order to learn how to pull well on the horizontal bar, you need to work on biceps. As, for example, Mark Jordan from Texas, who was able to pull himself up during the day 4321 times. At the same time, the record holder is far from young – at the time of setting the record, in 2015, he was 54 years old.
Why on the birthday of children tug on ears
Ear tugging was often accompanied by different sentences like “… grow big and don’t be noodles”, and mostly boys were pulled (pulled) by the ears, explaining that it was they who needed to grow tall. One way or another, but this custom was very famous, perhaps even around the world. What is now perceived as fun for children in ancient times was a very important and crucial moment in the legal practice of buying and selling movable and immovable property.
The transaction usually took place on the market square and the parties, reaching an agreement on the price, took up their hands on the subject of sale (for example, horse, cows, etc.) and loudly publicly spoke (shouted) in turn: “I sold such and such to such and such a sum of my horse ”and“ I bought such and such a horse from such and such a horse for such and such a sum ”, after the third repetition, the former owner let go of the horse (removed his hand) and from that moment the ownership of the horse changed , which was further considered the owner by virtue of the possession of the horse itself without any additional papers. In Roman law, this custom is called manziation from the word “manu” -hand (by the way, here comes the manuscript, manual, manual, and the term emancipation, which historically is mostly associated with the “liberation of women”, although it is legally assigned to the procedure for obtaining full legal capacity by minors in certain cases ) Unlike movable property with its relatively short life (up to 7-10 years) land plots were a much more important and “long-playing” object, which, moreover, could not be sold according to the rules of the market, and in addition, direct ownership of land is only possible for house plots . Nevertheless, they sold the land according to the same market rules. To do this, 12 witnesses were selected who walked around the perimeter of the land three times along with the seller and the buyer, and the latter, as in the market, repeated “I sold …” and “I bought …”, pointing with their hand to the same piece of land. Of the 12 witnesses who then had to confirm the fact and content of the transaction, if necessary, 6 were adult men and 6 were boys aged 7-12 years, counting on a distant future, so to speak, “for growth”. It was these very boys and adult uncles who were snooping around — they tugged at the ears, tweaked, quilted the rods and in every possible way brought to tears with words of approximately the same meaning: “If you grow up, remember where and why you were beaten so that you remember who sold the land to whom”. And how else to actualize such a boring event in children?
Interesting facts about the kidneys
Kidneys – the body responsible for cleansing the blood of toxins that accumulate in the body as a result of metabolism. Blood enters the kidneys through the veins and passes through special filters – nephrons that cleanse the blood. Finding out where the kidneys are is not difficult. You need to put your hands on your belt and take your thumbs up. The kidneys are located on the line between the tips of the fingers.
Urolithiasis is the most common and serious kidney disease. Indian doctor Ashish Rawandale-Patil, a urologist from Dhule (Maharashtra), won a place in the Book of Records for removing a record number of kidney stones from one kidney – 172155. An exacerbation of kidney disease most often occurs in winter due to for lack of vitamins at this time of the year. In a pregnant woman, the load on the kidneys increases tenfold. Every day, 1500-2000 liters of blood are filtered in the kidneys. In 5 minutes, the entire amount of blood contained in the body manages to pass through the kidneys (in an adult it is about 5 liters). And all the blood fluid per day manages to be filtered approximately 300 times. Blood enters the kidneys through the renal artery. In the kidneys, it is cleared of metabolic products. These kidney products are excreted through the urine. And the purified blood leaves the kidney through the renal vein. The total length of the capillaries in the kidney is 25 kilometers. One kidney consists of 1 million filter elements. The kidneys weigh from 120 to 200 grams, with the right one weighing slightly more than the left. In thickness, they reach a size of 4 cm. The first artificial kidney, the hemodialysis apparatus, was used in 1944. In 2013, American scientists developed an implantable artificial kidney created by the bioengineering method. According to statistics, for every 10,000 kidney transplant surgeries, the death rate is about 5 people. In developing countries, this parameter is ten times higher. A kidney donor reduces life expectancy by 10-15 years. The cost of one kidney varies from 1 to 30 thousand US dollars depending on the country. 27-year-old Simon Darnis from the United States sold a kidney in order to “pump his character” in the popular computer online game World of Warcraft. Since 2006, Kidney Day is celebrated – the second Thursday of March. 27. With arterial hypertension and heart disease, kidneys also suffer. Renal failure increases the risk of heart attack and stroke by 25 times.
Why do the pimples appear on the hands
With the onset of the cold season, many notice that the skin on the hands begins to crack, and any contact with water becomes painful at all. There are many reasons for the development of the disease. Often, the disease develops due to the fact that delicate skin of the hands is improperly taken care of, the development of chicks and a variety of allergic reactions also contribute.
Why do chicks appear
As a rule, pimples on the hands appear in winter or autumn, when the outside temperature is minus. Often one contributes to the other. Even mittens and gloves can not always help prevent their appearance. The fact is that the fat layer on the hands is very small. Therefore, the skin dries very easily, which leads to the formation of peeling and the appearance of small wounds.
There are a number of triggering factors accompanying the appearance of chicks:
Tendency to allergic reactions (cold allergy);
Improper hand skin care or lack thereof;
Features of the skin of the hands, for example, very thin skin, prone to irritation;
Reaction to contact with household chemicals.
Most often, chicks appear in people who have hypersensitivity. In addition, taking hormonal drugs, changing hormone levels in women, vitamin deficiency, also act as provoking factors.
The main symptoms of the appearance of chicks
The appearance of chicks on the hands is accompanied by characteristic symptoms. At the initial stage, slight swelling is noted, which is accompanied by edema in the area of the hands. Then cracks appear, the patient is worried about itching. However, similar symptoms are characteristic of other skin diseases, for example, scabies. If these are really pimples, then you need to start their treatment. This pathology can lead to serious health problems. Since small cracks contribute to the penetration of a variety of pathogenic microbes into the body. Therefore, there is a risk of complications. If you start the disease, then a purulent process can begin. In this case, it will have to be treated seriously and for a long time.
How to treat pimples on the skin of hands
When treating any disease, you should not self-medicate, you should visit a doctor and adhere to the prescribed course of therapy. In order to get rid of chicks, be sure to wear mittens or gloves in the winter. Before going out, apply a nourishing cream to your hands. With increased sensitivity of the skin, you should not wear wool mittens, since this material can provoke irritation. This will only worsen the situation. The most common mistake is trying to warm your hands in warm water. It also contributes to the appearance of chicks. You just need to stay warm and gently rub your hands. It is also recommended to use a baby cream. Well-proven regular Vaseline, which can be purchased at any pharmacy.
Household chemicals – provoking factor chicks
Many housewives do not consider it necessary to use rubber gloves when washing dishes or when washing clothes. Contact with detergents leads to the fact that the skin of the hands becomes very dry and begins to crack. Therefore, when doing homework, you must use gloves. Rubber and latex gloves, which can be purchased at any store, are well established. You can combine homework with river skin care. You need to apply a nourishing cream, and then put on gloves. Do not use very aggressive household chemicals. It can be replaced with folk remedies, for example, dry mustard or simple soap.
Frequent diets can lead to the development of vitamin deficiency. A similar condition occurs quite often in the spring, when the body lacks vitamins. Therefore, you should carefully consider your own diet. It is very important that it contains foods rich in vitamins of groups A and E. Especially in the winter, you need to include fruits and vegetables in your diet. Salads from boiled vegetables, which are seasoned with vegetable oil, will be useful. It is also worth adding kefir and other dairy products to your diet.
The appearance of chicks due to hormonal imbalance
This problem is very often encountered by women. In this situation, a consultation with a doctor will be required. It is advisable to undergo a full examination in a antenatal clinic, as well as visit an endocrinologist. In the event that the use of creams and traditional medicine does not help, and the disease begins to progress, then you should definitely consult a dermatologist. It is necessary to undergo an examination and find out the cause of the deterioration of the skin. Do not forget that any disease is well treated only at the initial stage, in an advanced state it easily passes into a chronic form.
What part of the human body can regenerate
Tritons and lizards are widely known for their ability to regenerate damaged limbs. Newts are able to restore the lens of the eye, limbs and tail, part of the lower jaw with new teeth. Lizards are just a tail. In mammals, the most significant vivid example of complete organ regeneration is the annual change of horns in ungulates of the deer family. Another interesting fact is the ability of bats to repair holes in the skin of wings, and in rabbits and domestic cats, holes in the shell of the ears, and the ability to grow fingertips in mice. The fact that the human body also has natural ability to regenerate is said by numerous statistics. You will not believe it, but a cut off human finger can grow back.
In the early 70s, in England, as a result of a medical error, one teenager with an amputated phalanx of the finger did not undergo the usual procedure in such cases for suturing a wound with a skin graft, which leads to the formation of a stump, or an attempt to sew an amputated phalanx microsurgically, which leads to deformations due to scars and decreased tactile sensitivity. When surgeon Cynthia Illingworth (C.M.) discovered the omission, she also found, to her deepest surprise, that the fingertip was regenerating. Then she stopped interfering in the natural course of things in similar cases and by 1974 had documented several hundred regenerated fingertips in children under 11 years of age.
Clinical studies of other doctors have confirmed that if you lose the first phalanx of your fingertips to a certain level (Fig. 2), the missing part will invariably recover within three months. At the same time, the border between complete restoration or absence thereof is very clear and without an intermediate zone. Therefore, today, with a partial loss of the first phalanx of the fingers, surgeons amputate the rest, since the newly grown fingertip will be much better than that sewn because of the inevitable scars. In this case, the wound should remain open and the fingertip will grow back with an excellent nail and fingerprints. Initially, it was believed that only children are able to restore fingertips in this way, but RB Borgens (R.B.) unambiguously states in his publication that this phenomenon is observed in both children and adults.
Interesting Finger Facts
Blood for analysis is most often taken from the ring finger. This is because he is less involved in the work, in contrast to the index and middle. The skin on it does not rough, as it is rarely involved in any actions. A puncture is less painful. The little finger is directly connected to the shells of the brush. He is also unsuitable for drawing blood. There is a chance of infection, and it spreads very quickly along the arm. The strongest fingers in a person are the index, middle and ring fingers. An adult with extended arms can support a weight of 55 kg, much more when bent.
Throughout life, a person bends his fingers about 25 million times. Representatives of Finnish, Tatar and Persian languages also call the ring finger. Experts believe that this phenomenon is due to faith. They are convinced that the finger is endowed with magical properties, therefore it is forbidden to call him by name. The tradition of using fingerprints as an identity card dates back to antiquity and has survived to this day. So illiterate people of all times and peoples, instead of signing, leave their imprint on the documents. And in Japan, on especially important documents, instead of printing, they leave fingerprints of the 1st and 3rd fingers. A fingerprint just made weighs only 0.000001 g. It contains fat, salt, proteins and water, which are released by the skin and the paint itself. Fingers are one of the most sensitive parts of the human body. They have the ability to capture vibrations whose amplitude is only 0.002 mm. On the feet, only thumbs have a name. They didn’t come up with anything else for the rest. A rare mutation in the SMARCAD1 gene can lead to adermatoglyphia, a genetic disorder expressed in the absence of fingerprints in humans. Currently, only 4 families have been documented throughout the world with adermatoglyphia. The erroneous opinion that the ancient Roman spectators in the Coliseum chose life or death for the vanquished, pointing their thumbs up or down, arose after the appearance of the painting ‘Pollice Verso’ by the artist Jean-Leon Jerome, who did not know much about Latin culture. In fact, the thumb bent in any direction meant death for the vanquished, symbolizing a naked sword. And in order to bestow life, they showed a clenched fist, alluding to a sword hidden in its sheath.
During the Hundred Years War, the French cut off the middle and index fingers of captured English and Welsh archers. Thus, they could not use the bow for shooting. Later, the victorious British began to show the French the presence of a middle finger – this is how the notorious “fuck you” gesture appeared. And his middle and forefinger in the form of the letter V – “viktory” or “victory”.
Interesting muscle facts
And you know that muscles are one of the most important elements of our body. This part of our body has long been studied and scientists have found many interesting facts about the muscles that are still unknown to most people. We have selected the most entertaining of them, which we will now consider.
In our body, there are about 640 muscles, with 25 percent of all these muscles located on our face and neck. It is thanks to them that a person has complex facial expressions that allow expressing the widest range of feelings and emotions even without the use of voice or gestures. It is interesting that no matter how much you are involved in the development of the muscles of your body, the jaw muscle will still remain the strongest in our entire body. The strength of its compression can reach up to 400 kilograms. Of course, even the strongest tooth enamel is not able to withstand such a load, so the average compression force is not more than 15-20 kilograms. Even during normal walking, 25 percent of all the muscles of the body are involved. In order to take just one step, we need to reduce and relax more than 200 muscles in a certain sequence. This figure may vary slightly depending on the anatomical features, but the essence remains the same. This fact suggests that all the muscles of the body work in close interaction with each other, and problems with literally one of them (tearing, stretching, and so on) will entail serious pain and will specifically limit the person in terms of motor functions. The heart is the most enduring muscle of our body. It’s no secret that our heart works tirelessly 24 hours a day to constantly pump blood. Of course, it rests between contractions, but no other muscle is capable of such endurance. Scientists have calculated that the average human heart is designed to run smoothly for 100 years. Of course, this calculation was performed on the basis of ideal circumstances. It is also worth noting that with all this, the muscle generates pressure that can create a column of liquid four stories high. All muscles develop in their own way, and require a different time period for recovery after exertion. Unfortunately, even most athletes are not aware of this important factor, and are training to develop immediately a large number of different muscle groups. This is a big mistake, because overstrain will not only prevent the muscle from continuing to build mass, but can also lead to very unpleasant consequences. Triceps is one of the fastest recovering muscles in our body, but the back muscles need the most time, despite the fact that they are not particularly large. Thanks to speech, we train and develop more than a hundred muscles daily. Speech is one of the few features that distinguish a person from higher animals, and thanks to it we can not only communicate with each other, but also develop a huge number of muscles in the oral cavity, throat, chest, lips, diaphragm, abs, jaws and face. Most people assume that these muscles cannot be developed, and they are constantly in approximately the same position, but this is not so, and if you do not speak for several months, you will almost completely lose this ability and it will be very difficult to return it.
An interesting fact about muscles for beginner bodybuilders. It turns out to burn muscle mass is two times harder than gaining. Even many athletes do not know about this pleasant moment, however, it is not at all easy to lose the gained muscles. Muscle volume leaves the human body the very last, after fat, so even relatively large breaks in training will not harm you in any way. Even undeveloped muscles can withstand enormous loads. All our muscles work daily to maintain the body, allow us to move, and generally perform complex physical exercises. That is why even a muscle that is not developed at first glance can constantly bear record loads. On average, one square centimeter of muscle cross-section is designed to work with 10 kilograms. It is for this reason that even people with extreme stages of obesity can continue to walk and move, and much faster they have problems with bones and tendons, and not with muscles. Interestingly, not everyone has a long palmar muscle, and many people only have one arm. However, functional accessories do not exist for her, because in animals it is used to release claws, and in humans, most likely, it is simply a rudiment. Nevertheless, if you still have it, then in case of serious damage to muscle tissue, doctors can use it to heal the affected area. Almost 50 percent of the body’s energy is consumed daily muscle contraction. Even if you do not play sports, about 40% of the energy received from the breakdown of molecules goes precisely to muscle contraction when performing ordinary actions. For this reason, athletes process their diet, increasing portions, and focusing on energy-rich protein. The most interesting thing is that after forty years, human muscles begin to decrease in size, that is, the body begins to burn muscle mass. Studies show that in the absence of exercise, people over the age of forty lose from 2 to 3 percent of their muscle mass per year. After sixty years, this trend intensifies, and the loss can reach 5%. It is precisely because of this that people with ages often have problems with tendons, because muscle tissue is becoming less and less, it no longer supports the body so effectively, which means that unnecessary friction increases every year. As a result, the tendons are completely erased, and are no longer restored. That is why sports activities from the age of 40 are extremely important.
Interesting facts about the brain
In the cerebral cortex of the human brain there are up to 17 billion nerve cells — neurons, which form a network of interwoven fibers, labyrinths, and intricate passages. Our feelings and actions, accompanied by electrical impulses, are transmitted from cell to cell. Thus, interconnection is maintained between all cells. In humans, the ratio of brain weight to body weight is the largest compared to any of the representatives of the animal world. If in a horse the ratio of brain weight to body weight is 1: 400, in a dog – 1: 100, then in humans it is – 1: 50. If the whole human body at rest consumes about 300 cubic centimeters of oxygen per minute, then the brain absorbs the sixth part of this amount, that is, 50 cubic centimeters, regardless of whether a person is sleeping or awake. Of the 500 grams of carbohydrates consumed by a person per day, about 90 consumes the brain. Brain size does not affect a person’s intellectual abilities. Nevertheless, according to researchers, the mind depends on synapses – contacts between neurons. The number of synapses grows in the childhood and youthful periods of a person’s life and affects intelligence. The heaviest brain – 2900 g – was discovered in an individual who lived only 3 years. Its brain was functionally inferior The speed of the nerve impulse that enters the brain or from it is 274 kilometers per hour. The brain weight of normal people ranges from 1020 to 1970 grams. The brain of men weighs 100-150 grams more than the brain of women [The mass of the brain is only 2% of the total body weight, but it consumes 20% of the oxygen that circulates in the blood – more than any other organ. The brain itself does not feel pain. But this does not save you from a headache – the brain is surrounded by many tissues, nerves and blood vessels, which will be a source of pain. A three-year-old child has 3 times more nerve cells than an adult. If you do not use the full potential of the baby, then with age, unclaimed cells die. Therefore, from infancy, you need to actively educate children. The corpses of people executed by hanging or choosing this method for suicide may have an erection. This is caused by the pressure created by the rope loop on the cerebellum. In men, urine or mucus may be released, in women, blood from the vagina. The left hemisphere of the brain is responsible for the right side of the body, and the right for the left. One of the oldest methods for examining the brain is the ablation technique, which consists in the fact that one of the parts of the brain is removed, and scientists are observing the changes that such an operation leads to. Ordinary laughter requires the work of five different areas of the brain. A man cannot laugh by tickling himself. The cerebellum, which is responsible for the sensations caused by its own movements, prevents this, and sends commands to other parts of the brain to ignore these sensations. An exception to this rule may be tickling the palate with the tongue. It has been experimentally confirmed that cockroaches can live without a head for several weeks. The blood circulation of cockroaches is not controlled by the brain, they breathe through small holes throughout the body, and on pre-eaten food supplies can exist for a long time. Dolphins need to constantly breathe atmospheric oxygen, for this they regularly emerge. To provide such breathing during sleep, the hemispheres of the dolphin’s brain sleep in turn. If we talk about the smallest brain as a percentage of body weight, then in modern cartilaginous fish it is 0.06-0.44%, and the brain size of large dinosaurs was even smaller. Without oxygen, the human brain lives for no more than 6 minutes, and then irreversible processes of death of nerve cells begin to occur.
Interesting facts about breathing
Let me rephrase the famous philosopher of antiquity: “You breathe – then you exist!” And so, let’s go … interesting facts about such an important process for life as breathing. Depending on the metabolic rate, a person exhales on average about 5 – 18 liters of carbon dioxide (CO2), and 50 grams of water per hour. Permanent mouth breathing is a direct route to sinusitis and other problems with the nasopharynx. The reason is simple – when we breathe through the nose, the air is filtered and warmed before it gets into the throat, we breathe through the mouth – we breathe the cold. Hence the diseases of the ear, nose and throat. The more intense you breathe (the effect of hyperventilation of the lungs), the more hungry you become, because deep and rhythmic breathing stimulates the production of gastric juice, as well as cellular metabolism. It is recommended that you exercise while you retain the ability to breathe through your nose. If you are forced to breathe through your mouth from physical activity, then you are working for wear. During sleep, a person can quite naturally change position from one side to another. This is due to the balance of breathing that is created when air passes through the nostrils. An interesting point: in yoga it is believed that when we mainly breathe through the right nostril, the body is ready for active activity (the day has come for it), and when we breathe through the left nostril, it means the body needs rest (night has come). Moreover, “night” and “day” in this case do not necessarily coincide with the time of day. These are just the internal, energy needs of the body, which are worth listening to. If you often inhale through the nose and exhale through the mouth, then the balance of carbon dioxide in the body may be disturbed, which will lead to its loss. Holding your breath can increase your carbon dioxide levels, which balances your pH. If the lungs are deployed on a flat surface, they can cover the tennis court! The air capacity during inspiration in the right lung is greater than that of the left. Every day, an adult inhales 23,000 times, and exhales as many times. The ratio of the duration of inspiration to exhalation during normal breathing is 4: 5, and when playing a wind musical instrument – 1:20. Maximum breath holding 7 minutes 1 second. An ordinary person during this time should inhale and exhale more than a hundred times. In Japan, there are special clubs where it is possible for a small fee to breathe fresh, specially purified and aromatized air. Dolphins need to constantly breathe atmospheric oxygen, for this they regularly emerge. To provide such breathing during sleep, the hemispheres of the dolphin’s brain sleep in turn. The breath of a jellyfish is very different from the breath of a person or even a fish. A jellyfish has no lungs and gills, as, indeed, any other respiratory organ. The walls of her gelatinous body and tentacles are so thin that oxygen molecules freely penetrate through the jelly-like “skin” directly into the internal organs. Thus, the jellyfish breathes the entire surface of its body. Beavers can hold their breath underwater for up to 15 minutes, and seals for up to half an hour. Insects have no lungs. The main respiratory system of their trachea. These are interconnected air ducts that open outwards on the sides of the body with spiracles. Fish also breathe air, getting it from the water that enters the mouth, washes the gills and exits through the gill slits.
Why are tears salty
When we cry, a special gland produces a salty liquid, which we call tears. And they are needed so that the eye can get rid of foreign objects. Tears also perform the function of moisturizing the eyeball and help relieve stress. However, why does the tear taste salty? We will try to explain it to you! It turns out the whole thing in their composition. Approximately 99% of the tear consists of H2O (water), and the rest is inorganic substances, including and, of course, sodium chloride (salt). The percentage of salt is extremely small, but the taste in a tear is pronounced. The reasons for the concentration of sodium chloride are still poorly understood, but general patterns have already been deduced. The salinity of the tears depends on the various metabolic processes in the body of each person. When a person cries, then his thyroid function increases, and the adrenal glands begin to function intensely. At the same time, the heart rate increases. Thus, the body is under stress, which is similar to heavy physical exertion. Then potassium and magnesium ions are mixed with sodium chloride, which gives an additional bitter taste. These are the most salted tears. Endocrinologists argue that such tears flow more often from self-pity. There are tears with a lower level of salt content, for example in young children, as well as in adults crying with joy.
Interesting facts about the human body
Clean, intact skin has the ability to kill germs. This confirms this experience. 30 million germs were applied to the clean skin area. In an hour there were only 720 thousand, and in two – only 7 thousand. During sleep, about 5 liters of air per minute passes through our lungs, while we sit – 6 liters, and during ice skating – up to 20 liters or more. It has been experimentally proved that a person speaks on average 125-160 words per minute, and thinks the same words three times faster. There are four kinds of taste cells, thanks to which a person receives four main taste sensations: bitter, sweet, sour and salty. Interestingly, different parts of the tongue are differently susceptible to taste irritants: the tip of the tongue is most sensitive to salty and sweet and slightly weaker to sour, the edge of the tongue to sour, the base of the tongue to bitter. The intestinal canal of an adult is 4 times longer than its growth, and the intestinal canal of a child is 6 times. If, instead of skin, our body were covered with a case impervious to heat, like a thermos, then in an hour our body temperature would have risen by about one and a half degrees, and in forty hours it would have reached the Boiling point. An adult, even without doing any work, emits as much heat as a 50-watt light bulb. With gradual heating, the human body in dry air is able to withstand not only the boiling point – about 100 degrees, but sometimes even higher – up to 160 degrees Celsius. However, it is necessary that the body does not come in direct contact with the heat source and that the heated air is dry. Only one in 2 million people lives up to 116 years or lives more. In 1 year, our heart pumps approximately 1,500.00 liters of blood through the body. Human eyes – do not grow from birth, but the nose and ears never stop growing. If people had the same mortality as in the 1900s, more than half the people in the world would be dead. The average adult can read 150-200 words per minute and the average person’s dictionary consists of 5,000 – 7,000 words. Our scalp hair grows at a speed of 0.35 mm per day, and our nails usually grow at a speed of 0.1 mm per day. It will take about 3 months to grow a new nail. 30,000 of the cells in your body will die and be replaced by new cells while you read this web page. The longest bone in the human body is the thigh. Doctors have noticed that most people who stutter do this less often when talking to pets. More than 6% of the population donate blood. The reason you don’t laugh when you tickle yourself is because your brain expects and ignores your own touch.