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Name - Sarah Kelly Unit - Advanced Physiology Assignment Title - The Heart The cardiovascular system consists of the heart, and its close connecting circuit of arteries, veins and capillaries. These structures supply the body with a constant flow of blood, which with pressure via the strong, elasticated walls of the arteries brings oxygen and nutrients to the tissues and returns to the heart, at a low pressure by way of the weaker, thin walled veins. Arteries have much thicker walls with three layers which consist of Tunica interna, this is the inner most layer and has a smooth layer of cells which prevent the blood from sticking to either sides of the artery wall and causes clotting. The next layer is a smooth elasticated muscle called the Tunica Media and the outer layer is the Tunica Externa. Each of these layers provides support and strength and also a change of diameter...

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