Why does the heart never rest?

The heart is the most important organ of the human body. it can maintain breathing, blood pressure and body temperature, and it can maintain blood circulation in the body as long as life does not stop, our heart will work day and night. Like an indefatigable machine, why doesn't the heart rest? Fatigue occurs in the muscles of the human skeletal torso, but not in the smooth muscle of the heart muscle. There are two types of cardiomyocytes in the heart, which relax after the stimulation disappears. It is combined into a heartbeat. Excitement is constantly generated and transmitted to ordinary cardiomyocytes to maintain a normal heartbeat. 2. The heart pays great attention to its own protection. During the growth and development of the human body, a working heart cycle of the combination of work and rest has been established, which is the law of shrinking and relaxing the heart. The contraction time of atrium and ventricle in a heartbeat was 0.1 seconds and 0.3 seconds respectively, while the diastolic time was 0.7 seconds and 0.5 seconds respectively. The mode of rest is very good, and the atrium and ventricle contract alternately.

The heart is the most important organ of the human body. it can maintain breathing, blood pressure and body temperature, and it can maintain blood circulation in the body as long as life does not stop, our heart will work day and night. Like an indefatigable machine, why doesn't the heart rest?

1. Because the human heart muscle is very special, the muscles of the human skeletal torso will be tired, but the myocardial smooth muscle is not. There are two types of cardiomyocytes in the heart. Most of them are ordinary cardiomyocytes. After being stimulated, they contract; after the stimulation disappears, they relax again. Such a contraction and a relaxation combine to form a beat of the heart. Other cells are special cardiomyocytes, which can continuously produce excitement and transmit it to ordinary cardiomyocytes according to their own inherent law, that is, self-discipline, and stimulate them to contract and relax, so as to maintain a normal heartbeat.

2. The heart pays great attention to its own protection. During the growth and development of the human body, a working heart cycle of the combination of work and rest has been established, which is the law of shrinking and relaxing the heart. If the heart beats 75 times a minute, one heart cycle accounts for 0.8 seconds. The time allocation of one heartbeat shows that the contraction time of atrium and ventricle is 0.1 seconds and 0.3 seconds respectively, while the diastolic time is 0.7 seconds and 0.5 seconds. This kind of working rule makes it very good at working and resting. The way of rest is very good. Atrium and ventricle contract alternately, rest alternately, and contract for a certain time, relax at the same time, rest at the same time. The rest time is longer than the working time, in a day and night, work less than 12 hours, rest more than 12 hours, it is rest when relaxing, but also take turns to rest when contracting.

3. The heart also relies on its own coronary artery to continuously supply blood to ensure that it has enough nutrition and oxygen to beat. Because of this, the heart can maintain a strong working ability for life, so that the blood circulation will never stop.

It is precisely because the heart does not rest, keep beating can maintain people's life, so this situation must pay attention to rest, avoid fatigue, try not to stay up late, especially stay up late for a long time, it is too easy to lead to sudden death, for their own health, proper exercise, strengthen the physique, more conducive to health.