Human blood accounts for about 8% of body weight, and a person weighing 50 kg has about 4000 ml of blood. Under normal circumstances, only 80% of this blood runs in blood vessels, and the other 20% is stored in the liver and spleen for emergency use.
When the human body is engaged in strenuous activities or a small amount of blood loss, the blood in the blood bank will be released to participate in blood circulation and maintain the normal physiological functions of the human body. The human body has a strong ability of self-regulation, and the blood volume often changes within a certain range, which is not harmful to health.
Extended data
Health benefits of regular blood donation:
The human blood is constantly metabolized all the time. Even if you don't donate blood, the blood cells in your body will age and die and become blood waste.
Regular and moderate blood donation can enhance human immunity and disease resistance, stimulate bone marrow hematopoietic organs, promote human metabolism and prolong life. At the same time, regular and appropriate blood donation can alleviate hyperviscosity and reduce blood viscosity, which has certain positive significance for preventing cardiovascular and cerebrovascular diseases.
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