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The cardiovascular system is a component of the circulatory system (the other component being the lymphatic system) and consists of the heart, blood vessels and blood. Its 3 main functions include:

1. Transport of oxygen and nutrients toward and wastes away from cells of our body

2. Immunological protection of our body from foreign organisms and substances

3. Maintenance of homeostasis including the regulation of body temperature, blood pressure, electrolytes and water balance.

Because the cardiovascular system interacts with other organs of the body in a complex fashion, you cannot simply state that it has one main or overall function. Like most organ systems of the body it serves several vital roles which are necessary for the survival of the organism. However, in terms of IMPORTANCE, the function of transportation (of which oxygen if often cited as essential) would probably rank as paramount above the maintenance of homeostasis and immunologic protection.

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