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The cardiovascular system consists of the heart, blood vessels, and blood. This system has three main functions: Transport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes).
The function of the heart as a pump is to supply the body with constant blood flow. As cardiac output is dependant on both heart rate and stroke volume, either can be manipulated to effect change in blood supply.