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The organ system in which the blood is pumped through the heart and circulates throughout the body through the blood vessels. Supplement. The cardiovascular system is a closed circulatory system seen in humans and other vertebrates. Its components include the heart, blood vessels, and blood.
The Cardiovascular System: The Heart I. Introduction A. The major function of the cardiovascular system is to circulate substances throughout the body. In other words, its organs function to supply cells and tissues with oxygen and nutrients and also to remove wastes, CO 2 and urea, from cells and tissues. B. If cells do not receive O 2 and nutrients and wastes accumulate, cells will die! C. Remember this is the cardiovascular system, which is composed of the heart and blood vessels. Blood, a connective tissue, is circulated through these organs. D. Cardiology is the study of the heart and the diseases associated with it. II. Location and Size of the Heart A. Location = within mediastinum B. Size = closed fist, ~300g in an adult