Blood has four main constituents: plasma, erythrocytes, leukocytes, and platelets.
Plasma is the fluid portion of blood. It is composed of numerous chemicals including sugars, minerals, and proteins (albumin, globulin, and fibrinogen).
Erythrocytes are red blood cells. They contain hemoglobin and carry oxygen to all the tissues of the body.
Leukocytes are white blood cells. They combat infections.
Platelets are important in blood clotting.
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