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Functions of the Heart. The heart functions include. 1  The heart generates blood pressure. 2  The heart routes blood through the systemic and pulmonary circulation. 3  The pumping action of the heart and the valves of the heart ensure a one-way flow of blood through the heart and blood vessels. 4  The heart helps regulate blood supply to tissues.
As you can see, the kidneys perform many functions that are important to your body: 1  Controlling the composition of your blood and eliminate wastes -- filtration/reabsorption/secretion method. 2  Influencing blood pressure -- renin secretion.  Helping to regulate your body's calcium -- vitamin D activation.