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Cardiovascular System

Blood Vessels

Where is most of the blood in the body at any one time?

Blood volume is not evenly distributed among the different types of vessels. Due to the expandable properties of veins, a vein will stretch about eight times more than an artery of corresponding size. At rest, the venous system thus contains about 65 to 70 percent of total blood volume, with the heart, arteries, and capillaries containing 30 to 35 percent of total blood volume. About one-third of the blood in the venous system is found in the liver, bone marrow, and skin.



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