10 Facts About The Human Body Will Make You Amazed
Come and get to know your body! Be sure to continue reading until the last because number #2 will surprise you.
10. Sweat has no bad smell
You’re not going to believe this, because all you have to do is sniff it to disprove our claim. And then, if sweat has no smell, why does humanity invent deodorants and lotions?
The sweat itself does not smell like anything, as it consists mainly of water. But it also contains acids released by the apocryphal glands in the axillary cavities, on the chest and the groin. Skin-dwelling bacteria decompose Sweating and Body Odor / Cleveland Clinic these acids, and the products of their activity produce an unpleasant aroma.
9. Eyes see the world upside down
This was proved by physicist René Descartes back in the 17th century. He projected an image from a carved bull’s eye onto a paper screen, and it was upside down – under Ronald S. Fishman. The Study of the Wonderful: The First Topographical Mapping of Vision in the Brain / JAMA Ophthalmology with all the laws of physics. The problem is that light is refracted by passing through the cornea and the lens, so the projection of the visible object is turned.
Why don’t we then see the world upside down? The thing is, our brains are flipping Ronald S. Fishman. The Study of the Wonderful: The First Topographical Mapping of Vision in the Brain / JAMA Ophthalmology image back, making its corresponding reality (and simultaneously images from two retinas into one glue).
In the 1890s, psychologist George Stratton experimented. Stratton, G. M. Some preliminary experiments on vision without inversion of the retinal image / Psychological Review,
How do we see things upright if the image formed on the retina in our eye is an inverted one? / PhysLink.com. He wore special glasses that turned over the image and wore them for eight days. On the fifth day, his brain just stopped adjusting, and Stratton saw the world normal again. Except his brain had to re-adjust when he took them off.
8. We have three kilograms of bacteria
If you believe you are the sole inhabitant of your body, you are mistaken. The number of bacteria in the human body is three times greater than Ron Sender, Shai Fuchs, Ron Milo. Are We Vastly Outnumbered? Revisiting the Ratio of Bacterial to Host Cells in Humans / Cell number of its cells. Except they weigh relatively little compared to our skeleton, muscles, and innards. Ron Sender, Shai Fuchs, Ron Milo. Revised Estimates for the Number of Human and Bacteria Cells in the Body / PLOS Biology,
Human Microbiome Project defines normal bacterial makeup of the body / NIH – about 1-3 kg (for a person of 170 cm height and weighing 70 kg).
In addition, we have not only bacteria but also archaea, mushrooms, protists, and viruses. Some of them make a real difference. Jack Gilbert, Martin J. Blaser, J. Gregory Caporaso, Janet Jansson, Susan V. Lynch, and Rob Knight. Current understanding of the human microbiome / Nature Medicine,
Gwen Falony, Sara Vieira-Silva, and Jeroen Raes. Microbiology Meets Big Data: The Case of Gut Microbiota-Derived Trimethylamine / Annual Review of Microbiology things – for example, participate in digestion and protect against pathogens and substances. Others just exist without bothering us. And still, others are busy at all. Live with it now.
7. Humans produce cyanide
Sodium, potassium, and hydrogen cyanides are the substances The Facts About Cyanides / Department of Health that kill quickly, preventing the body cells from absorbing oxygen. Cyanide has been used for centuries as a poison, a poison against pests, and even as a chemical weapon. Consumption of 0.1 grams of this substance is enough to kill a man of 70 kg.
The more surprising is that we constantly absorb cyanides in small doses like apples and spinach. Moreover, cyanide is produced by breathing! A healthy person at any given time. The Facts About Cyanides / Department of Health,
Hydrogen cyanide and cyanides: human health aspects / WHO in itself up to 50 micrograms of this substance per 100 grams of tissue. However, it does not accumulate in cells and is quickly excreted with urine and breathing.
6. Blood groups greater than four
If you ask how many blood groups there are in the world, you will say four Blood Type Tests / Healthwise. You probably learned that in school. The first (0) is about 48 percent of the population, the second (A) is about 36 percent, the third (B) is about 11 percent, and the fourth (AB) is about 5 percent.
Now, that’s not entirely true. The blood groups in the world are 29. At least that’s what Laura Cooling counted. Blood Groups in Infection and Host Susceptibility / Clinical Microbiology Reviews International Blood Transfusion Society. Antigens AB0 and Rhesus, by which they distinguish those four, are not the only, are other antigens. And many of them are named after patients who first discovered antibodies. There may be new ones in the future.
5. Wet wrinkled fingers are useful
You sat in a bathroom or a swimming pool, and your fingers got wrinkly? It’s not for nothing. Scientists count 1. Why your skin goes wrinkly in the bath / BBC,
Becky Summers. Science gets a grip on wrinkly fingers / Nature that at a high humidity the body uses a special mechanism and makes fingers so that they better capture moist objects.
If you’re drowning in a river and you’re trying to grab a branch, or you’re leaning on trees, when you’re sliding on the wet ground under heavy rain, wrinkles on the skin of your fingers make it more effective. Research by A gripping tale: scientists claim to have discovered why skin wrinkles in water / The Guardian, conducted at the University of Newcastle, showed that people with water-wrinkled skin on their toes and feet are better held on the slippery floor.
4. You can’t tickle yourself
When someone else tickles you, you can twitch, you can laugh, you can get out. But try tickling yourself, and you won’t succeed.
Samuel T Selden. Tickle / The Journal of the American Academy of Dermatology, that ticklish emerged in the process of evolution as a means of protection against insects, spiders, and other ill-pleasant creatures that crawl on people and may harm them. If someone else tickles you, it’s a treat too. But if you tickle yourself, can you tickle yourself? / BBC Future itself, the organism will not give a reaction because it will understand what it is doing to itself.
But if you find it funny or unpleasant that you’re tickling yourself, is that a bad sign that could be a sign of Can’t Tickle Yourself? That’s a Good Thing / SCIENTIFIC AMERICAN schizophrenia or cerebellar damage.
3. Women’s hearts beat faster
Does a woman’s heart beat faster?
Why does a woman’s heartbeat faster than a man’s 78-82 times per minute compare to 70-72 times for men. That’s because female sex hormones affect myocardial cells, accelerating their contraction. However, there is nothing to be particularly proud of, because because of this peculiarity of women who Worthy a woman’s heart beats faster than a man suffers from tachycardia and arrhythmia.
2. People make a bottle of saliva every day
Today our salivary glands are produced by Michael Edgar, Colin Dawes, Denis O’Mullane. Saliva and Oral Health / British Dental Journal from two to six glasses of saliva – 0.5-1.5 liters. You still haven’t drowned in it because you’re reflex-absorbing it all the time.
And at night, it’s possible, because people can’t swallow in their sleep. And to keep us from drowning, the organism decreases CCs. Dawes. Circadian rhythms in human salivary flow rate and composition / The Journal of Physiology quantity of saliva produced. So when you wake up in the morning, you usually feel dry in your mouth.
1. Humans are from dirt.
Dirt is the origin of humans. You never paid attention to your love of dirt after a rain.
Hope you enjoyed it!