Blood is composed of plasma, red blood cells (erythrocytes), white blood cells, (leukocytes) and platelets. Plasma is the fluid component of blood that is comprised of 90% water and 10% solutes, and constitutes 55% of the total blood volume.

Plasma contains glucose, protein, lipids, amino acids, electrolytes, minerals, lactic and pyruvic acids, hormones, enzymes, oxygen, and carbon dioxide.

Blood provides nutrients including oxygen to body cells. Oxygen is carried in the hemoglobin of red blood cells (RBCs). The white blood cells are the major defense mechanism of the body and act by engulfing microorganisms. Platelets are present in the blood. They gather at the site of a wound and aggregate (stitch together) to form a clot to stop the bleeding.

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