_______ in the wall of an arteriole allows it to constrict or relax, changing its radius.

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The smooth muscle in the wall of an arteriole allows it to constrict or relax, changing its radius. The endothelium lines the inner surface of the vessel and facilitates the exchange of substances between the blood and the surrounding tissue. Cardiac muscle is found in the heart, and connective tissue supports and connects other tissues and organs.

_______ in the Wall of an Arteriole Allows It to Constrict