Blood cells mainly refer to red blood cells, white blood cells, and platelets. Red blood cells mainly transport oxygen and carbon dioxide and buffer the acid-base balance of the body. Leukocytes consist of granulocytes, lymphocytes and monocytes, of which granulocytes are inflammatory response cells that gather and wander to the site of inflammation for phagocytosis; lymphocytes are mainly involved in the immune response of the body; monocytes target larger bacteria and parasites and accomplish killing and phagocytosis through the monocyte-macrophage system. Platelets are involved in the process of blood clotting, anticoagulation and fibrinolysis in the body. The various cells in the blood perform their respective functions and work together to keep the blood system in a normal functioning and dynamic stable state.