What makes the heart beat? Detailed answer

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What makes the heart beat? Detailed answer

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What makes the heart beat?

Most of us know that the heart is a pump. It pumps the blood in our body, thus making life possible. But what an amazing pump! With each beat, the heart pushes out about 100 cubic centimeters of blood. In a day, this amounts to about 10 liters of blood, which is pumped through the blood vessels. During the average life span, the heart pumps about 000 million liters of blood! Each beat of the human heart takes about 250 seconds. The heart makes about a hundred thousand beats a day and the same amount of rest between beats.

In general, this rest is 6 hours for the whole day. What we call the "beat" of the heart is the contraction and relaxation of the muscles. During contraction, blood is pushed out; during relaxation, a new portion of blood enters the heart. But this does not happen in a simple way, as, for example, you can open or close your fist. The contraction occurs in waves, starting at the bottom of the heart and moving upward.

What makes the heart beat? Is there an impulse to contract and relax from anywhere? Or does it happen on its own? This is one of the most mysterious questions in biology, and much remains a secret here. Let me tell you about one interesting experiment that has been known for hundreds of years.

Suppose you take a chicken egg and put it in an incubator for 26 hours. Now let's open it and with the help of a magnifying glass we will study those films in the egg, from which the heart of the chicken will later develop. You will see that these tapes are beating! Even before the tapes become the heart, they are already beating!

Now suppose you remove these films and let them grow in a favorable environment. If you cut a growing heart into six pieces, each piece will continue to beat at the same rate. How to explain it? We do not know. All we can say is that the heart has a certain automatic contraction characteristic. And one of the secrets of life - why the heart beats - remains a mystery!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Which foreign leader was called Yuri as a child?

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