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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).
Control of Cardiovascular System. The heart works as a demand pump. The CV system tells the heart how much to pump. CV system may alter capacity and, thus, how much blood it holds. Decreased capacity results in greater venous return to the heart and, thus, greater CO. This is accomplished by local and central control mechanisms.