Anatomy of the Heart
Essay that explains how each part works to provide a completely functioning pump. Include how substances are exchanged between blood in capillaries and the tissue fluid surrounding body cells, and compare the pulmonary and systemic circuits of the cardiovascular system.
The heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little larger than the size of your fist. By the end of a long life, a person’s heart may have beat (expanded and contracted) more than 3.5 billion times. In fact, each day, the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood.
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