How big is the human heart?

Generally everyone's heart is the size of a fist. The heart is on the left side of our chest. For an adult, it is about the size of my fist, about 14CM× 10CM, and weighs about 350g. The main function of the heart is equivalent to a power pump, which drives blood to circulate continuously in the human body. Blood runs through various tissues and organs formed by wide pipes distributed in arteries, arterial branches and capillaries, and transports and distributes nutrients to various tissues and organs; Unnecessary things are taken away by the venous system and transported to the organs that excrete waste, that is, through infiltration and treatment, the reusable parts are recovered and the useless or harmful parts are discharged. This closed piping system is the circulation system. This system is divided into two groups of pipes: one group is distributed in the head, chest, abdomen and limbs, which is called great circulation or systemic circulation, and the other group is distributed in the left and right lungs, which is called small circulation or pulmonary circulation. In order to share two sets of blood circulation, the heart is divided into two halves, the left half is called the left heart, which is the driving pump of the large circulation, and the right half is called the right heart, which shares the task of the small circulation.

The left heart delivers blood to the head, trunk, viscera and limbs through systemic artery, and brings various nutrients, essential substances and fully oxygenated red blood cells to meet their different needs, so that they can exercise well and complete their respective tasks. Through tissues and organs, blood and residual substances and carbon dioxide from veins are brought to the right half of the heart, and the right heart pumps blood into the lungs, where the blood entering the alveoli exchanges gas with air, discharges carbon dioxide and inhales oxygen, so that the blood can regain sufficient oxygen and return to the left heart through pulmonary veins, and the second round of supply around the body begins. This is a cyclical process. This cycle is completed by the contraction and relaxation of the heart (this is the "heartbeat" we can feel). The human heart starts working when it is still in the first month of maternal embryo, and it can't stop from now on, otherwise it will affect the function and survival of various organs and endanger our lives.

Our heart is the most unique organ-my brain can rest in sleep. Although the lungs and kidneys don't stop working, her interior can rest in shifts. Gastrointestinal tract can stop working if it is not digested, but not the heart. No matter how tired her heart is, she should go on working. Although her working condition will deteriorate due to illness and fatigue, she will keep working as long as life exists. Therefore, the heart is the hardest organ in our human body, and its working condition is closely related to our health and life.

The mother forms an embryo after conception, and the heart begins to beat rhythmically in the first month of embryo formation. In the process of life development, the heart develops fastest. The heart in infancy is only 16- 17 grams, which doubles at about one year old. 160g at the age of 0/6, but the adult male heart is 250-340g and the female heart is 230-280g.

A heart weighing half a catty can pump 8- 10 catty of blood every minute, which is equivalent to a big barrel of "Jinlong fish oil". Perhaps you will be surprised that the blood pumped by the heart day and night actually needs a big truck to hold it, reaching as much as 7 tons! If a person can live to 80 years old, his heart will beat about 3 billion times. The total length of blood vessels in the whole body is about 6.5438+10,000 kilometers, which is enough to circle the earth for two and a half times. The blood in these blood vessels is supplied by the work of the heart, and the time for blood to circulate in the human body is only 25 seconds! This shows that the labor intensity of the heart is great. What's more, other tissues and organs of our human body can rest when they are not working, but the heart can't. As long as life exists, no matter how tired or sick, the heart will continue to work. Therefore, the occurrence of coronary heart disease, rheumatic heart disease, cardiomyopathy and other heart diseases seriously threatens human health and life.