Blood is composed of various blood cells and plasma. It has a transport function. The blood can transport various nutrients needed by the human body to the tissue cells it needs. At the same time, the blood can transport oxygen to the various organs of the human body, while ensuring that carbon dioxide produced by cell metabolism is prevented. Antibodies such as white blood cells contained in the blood can cause immunity to pathogenic microorganisms and bacteria from the outside world
正在翻译中..