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THE HEART AND BLOOD CIRCULATION
Member rating: No Rating | Words: | Submitted: Thu Nov 24 2005
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THE HEART AND BLOOD CIRCULATION The heart is a four chambered muscular pump around the size of a fist. It beats about 100,000 times a day pumping around 2,000 gallons of blood through about 100,000 miles of organic tubing. The heart is a big muscle with four valves connected together to make a two-stage pump. The heart gets its energy by oxidizing blood sugars. This released energy, contracts the heart's many muscle cells, and the four chambers squeeze blood out into the arteries. The arteries are thick walled muscular tubes which carry blood away from the heart. The heart has two sides - the left ventricle and the right ventricle. The artery from the right ventricle pumps blood to the lungs, this is called the pulmonary artery and it is the only artery that carries deoxygenated blood. The artery from the left ventricle pumps blood to the rest of the body and...
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