Blood is a liquid tissue which consists of a liquid part or blood plasma and blood cells. Plasma contains a multitude of substances, such as proteins responsible for blood clotting (so called coagulation factors), ions, molecules important for all metabolic processes in the organism. Blood cells are red blood cells or erythrocytes, white blood cells or leukocytes and platelets or thrombocytes. Red blood cells are responsible for oxygen transfer to the tissues and organs, the white ones for defense of the organism from potentially harmful external agents and blood platelets play a role in blood clotting.
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