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Blood Vessels and Circulation
Venoconstriction and Venous Reserve
Description
Veins store blood and help return it to the heart. They act as capacitance vessels, which means they can expand and hold a large volume of blood under low pressure. Because of their large diameter and thin walls, veins are much more distensible than arteries. At any given time, they contain about 64 percent of the body’s tot...
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Transcript
Veins and venules can intrinsically act as blood reservoirs in the human body, holding approximately 64% of the total blood volume at any given moment.
They have a larger lumen and more distensible walls than arteries. This allows them to expand readily, accommodating a large blood volume at low pressure.
Due to their high capacit...
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