anaphy

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    • the cardiovascular system is composed of the heart and blood vessels
    • heart is a hollow muscular organ lying in the mediastinum
    • mediastinum is the center of the thoracic cavity between the lungs
    • the pumping action of the heart propels blood containing oxygen, nutrients, and other vital products to body cells through a vast network of blood vessels called arteries
    • blood returns to the heart through blood vessels called veins
    • on its return trip to the heart, blood picks up waste products from the body cells to deliver them to the organs of excretion
    • trillions of body cells rely on the cardiovascular system for survival
    • when the transportation system fails, life at the cellular level is not possible and, ultimately, the organism will die
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