Do you think that the ability to hold one’s breath for a long time depends on large vital capacity? Wrong, in fact, the key lies in it!

Usually, you need to breathe 16 times a minute when you are unconscious, but only when you are holding your breath, you will think of breathing. Most people can only hold their breath for about 30 seconds, but some people can hold it for 9 minutes. At this time, you must think that their vital capacity is very large. However, the key to holding their breath is not the lung, but the heart.

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When we dive into the cold water, our body will trigger a reaction called diving reflex because of the stimulation, which makes our heart rate drop by 25%, so that you can consume less oxygen. Not only that, we will give priority to the safety of the brain and heart, temporarily close other unnecessary organs, and the blood flow to the limbs will be reduced to the lowest speed, which is beyond your subjective control. Our heart is so magical.

We used to think that our thoughts came from our heart, ignoring the meaning of the brain. The heart is really very important to us, but it still depends on the brain. The heart is a precision mechanical pump made up of muscles. If you slow down the heart rate, you can see its precision.

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The contraction of the muscles in the ventricle is highly coordinated. These muscles are never tired and never stop. The heart expands and blood flows into the ventricle. Then, the heart receives an electronic signal demanding contraction and pushes the blood to all parts of the body. In order to avoid blood reflux, the heart needs a valve. When it closes, these valves will emit the familiar heartbeat “bang bang, Bang bang.

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This is the sound of life, these cells that control the rhythm of the heart, they will naturally produce rhythm, long before you were born, they have been beating rhythmically. When you’re an embryo, three weeks old, these cells start to beat.

From then on, these cells will be with you for life, and will not divide and regenerate, because myocardial cells will not divide, will not mutate, and therefore will not become cancerous, so no heart cancer has ever occurred.

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Each of us will heartbeat, heartbeat will accompany our life, if stop heartbeat, it means our life to the end. But why do we need a heartbeat?

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This is because the heart is responsible for promoting blood circulation, and the blood contains an important life substance – oxygen. The work of carrying oxygen in our body circulation is undertaken by a special kind of cells called red blood cells, which are born in our bone marrow. Deep in our bones, the cells that produce red blood cells are called trophoblast.

They nourish one red blood cell every five days. At this moment, there are 25 trillion red blood cells in your body, which deliver oxygen to your whole body. If you connect all the blood vessels in your body, they can circle the earth more than twice. Each cell needs to pass through the wide arteries, rotate into the smaller arterioles, and then squeeze into the tiny capillaries.

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In these smallest blood vessels, cells start their own task, they release carrier oxygen into human tissues, and cycle the process over and over again throughout their lives. However, the life of red blood cell is very short. After four months of hard work, it has already gone through every corner of your body, and its life has come to an end.

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When the red blood cells return to the bone marrow, the chemical changes in these old cells will attract the attention of the trophoblast, but this time it is not the red blood cells that are bred, it is the phagocytosis of the red blood cells. Every minute, 150 million red blood cells come to the end, and at the same time, 150 million new red blood cells are born.

This is an important reason why our body keeps the oxygen balance in our blood, but in some corners of the earth, the oxygen content in the atmosphere is not so high. In the plateau, our body will feel the lack of oxygen. However, in just three weeks, your body will start to adapt to the environment here. It will soon produce more red blood cells and carry more oxygen to your whole body.

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This adaptability is crucial for survival, because oxygen is the key to our body’s energy production. Even if you’re just lying down and looking at your cell phone, your body is consuming a lot of power.

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