Man – the most amazing creature that mother nature has created. He never ceases to be the focus of attention of scientists and doctors. It is studied not only its origin, behavior and appearance, but also the body. It is this complex and intricate system that allows us to live. And also the body – this is a small universe, where there are so many unknown and inexplicable things. The online publication has collected a selection of interesting facts about a person that will seem incredible to you, and in some places incomprehensible and even funny.
Ovum – the largest human cell, and the spermatozoon – the smallest
Muscle and skin cells are so tiny that they cannot be seen with the naked eye. With a female egg, which has a round shape, everything is different. After all, it is the largest cell of the human body.
It is quite possible to see an ovum with the naked eye in a petri dish. It looks like a poppy seed in size.
But the spermatozoon, compared to other cells of the male body, is very small. This feature allows the "tadpole" easily penetrate the egg and fertilize it.
Cornea – the only part of the body that does not receive blood
It would seem that the blood supply covers the entire body, from the head to the heels. But it was not there. There is a part of the body that does not naturally have a blood supply. This is the cornea of the eye. Deprived of blood vessels, it is absolutely transparent. And to feed the cells, it receives oxygen from the air. Therefore, the cornea can easily do without the work of the lungs and the circulatory system. It is worth noting that at night during sleep, less oxygen enters it, since at this time the eyelids are completely closed. The same thing happens when wearing contact lenses.
Human brain – "computer" containing the entire Internet
There are many interesting facts about man. Some have already become familiar to each of us, while the latter give time for reflection. The brain is a unique organ that haunts neither scientists nor doctors. It never ceases to amaze with its complexity and new and new discoveries in terms of its functions and capabilities. So, American neurophysiologists from the Salk Institute calculated the capacity of a person's memory. The results are amazing – several petabytes. This should be enough to contain all the content of the Internet.
One lung is smaller than the other – normal phenomenon
Most of you, when studying biology in school, probably thought that both lungs were the same size. But it is not so. Nature made the left lung smaller than the right, although in the pictures they practically do not differ from each other in size. This phenomenon is explained by the fact that the heart is displaced from the middle to the left. Therefore, the lung leaves little room for this organ. Such an uneven capacity of air in the lungs does not prevent a person from breathing normally and does not affect his well-being in any way.
Women smell better than men
Charm – an amazing property, thanks to which we distinguish many different smells, both pleasant and not very. It is this feeling that allows us to experience the world in its entirety. And, as scientific studies show, charm is better developed in women than in men.
Women are better at distinguishing the smell of citrus, cinnamon, coffee, vanilla and mint than the representatives of the strong half of humanity.
Scientists of the Federal University of Rio de Janeiro explain such an interesting fact about a female person by the fact that the female brain contains 50% more cells responsible for the perception of smells than in the brain of a man.
People can live much longer without food than without sleep
The opinion that one cannot live without food for several days, and without sleep – may be considered erroneous. According to doctors, a person can live without food for up to 2 months, but only on condition that he consumes enough water and has a supply of fat in his body. But without sleep can't last that long. Indeed, in the absence of this vital process, various negative changes are observed in the psyche: irritability, impaired attention and coordination of movements, memory lapses, hallucinations. Also, prolonged wakefulness – This is a huge burden on the heart and other organs. And the body, as a rule, does not stand it.
Almost every child is born with blue eyes
Character and appearance are usually passed on to the child from the parents. This applies to habits, and voice, and type of hair, and eye color. The latter is of particular interest. After all, for some reason, children are not born with brown or green eyes, like their ancestors, but with blue ones. Experts explain this phenomenon by the fact that the melanin pigment contained in the iris takes a little time to appear under the influence of light and demonstrate the true color of the child's eyes. And what will it be – dark or lighter, depends on light and genetics.
Some more interesting and funny facts about a person:
• During a passionate kiss, the same chemical reactions occur in the brain as during a parachute jump.
• Nightmares that happen at night are the result of a person sleeping in a cold bedroom.
• According to scientists, children are considered the most smiling creatures on earth, as they laugh about 400 times a day, while adults – only 15.
• If a person's eyes practically do not change in size throughout life, then the nose and ears grow.
• Dimples – this is not always an innate feature.
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