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From there, the blood leaves the heart through the aorta to be distributed throughout the body. Blood enters the heart through the superior and inferior venae cavae into the right atrium. This blood then flows through the right atrioventricular valve to the right ventricle.
The Heart: Conduction System. The heart pumps blood through the body. This is accomplished by contraction and relaxation of the cardiac muscle tissue in the myocardium layer. Intercalated discs allow impulses to travel rapidly between adjacent cells so they function as one rather than individual cells.