Blood vessels
There are three different types of blood vessels:
Arteries
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Carry blood away from the heart.
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Have thick walls composed largely of muscle and elastic tissue.
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Have small passageways for blood (internal lumen).
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Contain blood under high pressure.
Carries blood back to the heart. Have thin walls. Have larger passageways for blood (internal lumen). Contain blood under low pressure. Contain valves which stop the blood flowing the wrong way . Veins
Capillaries
Tags:Blood, vein, artery, arteries, capillaries, red blood cells white blood cells and platelets, red blood cell white blood cell and platelets