The circulatory system transportssubstances around the body. Blood vessels called arteries have thick muscular walls and transport blood away from the heart to other tissues and organs. Blood is taken from tissues to the heart by blood vessels called veins, which have larger lumens and thin walls. Capillaries are small vessels that exchange materials with tissues.
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The circulatory system transports substances around the body. Blood vessels called arteries have thick muscular walls and transport blood away from the heart to other tissues and organs. Blood is taken from tissues to the heart by blood vessels called veins, which have larger lumens and thin walls. Capillaries are small vessels that exchange materials with tissues.