Describe the differences in structure of arteries, veins and capillaries.

Arteries: carry blood away from the heart, have thick muscular walls, have small lumens, and contains blood under high pressure.Veins: carry blood to the heart, have thin walls, have large lumens, contains blood under low pressure and have valves.Capillaries: one cell thick, very low blood pressure, and gas exchange takes place here.

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