Arteriosclerosis - Hardening of the arteries, Atrium - The upper chamber of the heart, Septum - The wall that separates the two sides of the heart, Capillary - The smallest and thinnest blood vessel , Bicuspid valve - The valve located between the left atrium and the left ventricle, Tricuspid valve - Te valve located between the right atrium and the right ventricle,

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