The human cardiovascular system is a collection of interacting structures designed to supply oxygen and nutrients to living cells and to remove carbon dioxide and other wastes. Its major components are the:

a. Blood. Blood is the vehicle for oxygen, nutrients, and wastes.

b. Blood Vessels. Blood vessels are the conduits, or channels, through which the blood is moved.

c. Heart. The heart is the pump which provides the primary motive force.

d. Capillaries. The capillaries, minute (very small) vessels, provide exchange areas. For example, in the capillaries of the lungs, oxygen is added and carbon dioxide is removed from the blood.

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