The heart is a very important organ in the human body. Although it is only the size of a fist, its power is amazing. On a per-minute basis, the heart contracts an average of 70 times per minute, up to 100000 times per day, and beats out enough blood to fill an oil can. If there is no heart, or if the heart is impaired, not only is the circulation of blood in the body impossible, but also the organs of the body will not function properly due to the lack of blood supply, and the loss of life is the inevitable result.

Therefore, the heart plays a great role in the continuation of life. As long as life goes on, the heart works day and night. Even at night when it is resting, the heart is working silently. So, doesn't the heart get tired when it keeps beating? Does the heart need to rest? How does it rest?

Does the heart get tired? How does the heart rest?

The heart is made up of heart muscle, but heart muscle is different from the muscles of the human skeleton and trunk. The muscles of the skeletal trunk of the body are fatigued, but the heart muscle is not. There are two types of heart cells: ordinary heart muscle cells, which contract when they are stimulated, and stretch when the stimulus disappears. This is a contraction and a diastole combined to make a heart beat.

The other is the special myocardial cells, which do not need external stimulation, but have their own inherent rules, and these cells will continue to generate excitation and conduct to the ordinary myocardial cells in accordance with the inherent rules, stimulating them to contract and diastole, thus maintaining a normal heartbeat.

In addition, the coronary arteries of the heart itself constantly supply blood to the heart, and the heart has enough nutrients and oxygen to beat. It is also because of this that the heart is always able to work powerfully and in a never-ending state.

Won't the heart get tired if it works forever?Actually, the heart is not always in working condition. Every time the heart contracted and relaxed with great regularity, the heart was rested while it was working, and it can be said that the heart rested in a very clever way. The atria and ventricles alternate in contraction and rest, resting during diastole and taking turns resting during contraction.

According to research, the ratio of work to rest time of the heart is about 3:5, that is, the heart only works for 9 hours in a day and rests for up to 15 hours, and the heart often adjusts itself to rest before it feels fatigue. Therefore, the heart never gets tired.

Some people laughingly say, "If the heart rests, then I also rest." This is actually a misconception. The heart has its own way of resting, and it is because of this way of resting that human life can be sustained. However, this does not mean that we can do whatever we want. As mentioned above, it is the regular contraction and relaxation that allows the heart to rest while it is working. This will not only increase the burden on the heart, but also shorten its life span, thus affecting the life expectancy of the human body.

Therefore, we must pay attention to the protection of the heart, such as pay attention to rest, avoid fatigue, do not stay up late for a long time, etc.