Human immunity is the body's own defense mechanism, which can identify and destroy any foreign objects (viruses, bacteria, etc.). ) invasion from the outside; The ability to deal with the aging, injury, death and degeneration of their own cells, as well as the ability to identify and deal with mutant cells and virus-infected cells in the body. Immune system is a very complex system, including many defense lines against diseases, which exist in the form of protein, cells, tissues and organs.
From a physiological point of view, the main material basis of human immunity and disease resistance is white blood cells. White blood cells, commonly known as white blood cells, are very important blood cells in human blood. White blood cells shoulder many important tasks in the human body, with the functions of swallowing foreign bodies, producing antibodies, healing body injuries, resisting pathogen invasion, and immune resistance to diseases. The number of white blood cells in normal adults is between 8 billion and 20 billion. If you donate 200 or 400 ml of blood at a time, the donated white blood cells only account for 1-2% of the total white blood cells in human body. The lost white blood cells can be replenished from bone marrow within 65,438+0-2 hours. Therefore, the white blood cells lost in blood donation are very small in the human immune system.
In addition, human bone marrow has a powerful compensatory function. Under certain conditions, the hematopoietic function of bone marrow can be improved to 6-8 times of normal. A healthy person produces about 200 billion red blood cells and 654.38+02 billion platelets every day, that is, the number of new blood cells born per healthy adult is equivalent to the total number of human blood cells. Blood donation is also beneficial to the regeneration of human white blood cells. After donating 200 ml of blood, the human body will be replenished quickly and will not affect health.
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Author: Tadpole Jun