Formed Elements of Blood

Red Blood Cell

Erythrocyte:Transports oxygen and carbon dioxide; lives for 120 days

Plasma

Yellowish fluid, 90% water, 10% dry matter

Leukocyte

White Blood Cell

Granular leukocytes

Basophil, Neutrophil, Eosinophil

Platelet

Thrombocyte: Releases chemicals necessary for blood clotting; important for hemostasis

Neutrophil (50% - 70%)

Functions in cellular defense - Phagocytosis of microorganisms

Lymphocyte (25% - 35%)

Produces antibodies and other chemicals responsible for destroying microorganisms; contributes to allergic reactions, regulation of immune system

Monocyte (3% - 9%)

Migrates from the blood and becomes a macrophage (phagocytizes bacteria, dead cells, cell fragments, and other debris within tissues)

Eosinophil (< 5%)

Phagocytosis of protozoa and parasitic worms; Releases antiinflamatory substances

Basophil (< 1%)

Releases histamine (to promote inflammation) and heparin (to prevents clot formation)