The main components are plasma, blood cells and genetic materials (chromosomes and genes). It is a special connective tissue, that is, the organizational level in the living system.
Blood contains various nutrients, such as inorganic salts, oxygen, cell metabolites, hormones, enzymes, antibodies, etc., which have the functions of nourishing tissues, regulating organ activities and defending against harmful substances. Blood stores human health information, and many diseases need blood tests. Including genetic diseases.
Extended data
1, which transports oxygen to all parts of the body, mainly relying on red blood cells.
2. Transport nutrients such as glucose, amino acids and fatty acids.
3. Take away wastes, such as carbon dioxide, uric acid and lactic acid.
4, provide immune function, composed of white blood cells and antibodies.
5. Information functions, such as hormones and tissue damage signals.
6. adjust the pH value in the body.
7. regulate body temperature.
8. Hydraulic function.
Reference source
Baidu Encyclopedia-Blood (opaque red liquid flowing in the heart and blood vessels)