CircSystem_heart

CircSystem_heart - The Circulatory System & Heart Each...

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1 The Circulatory System The Circulatory System Each cell in the body requires delivery of energy, nutrients, and oxygen . Each cell also requires removal of waste products and carbon dioxide . These tasks (among others) are accomplished by the Circulatory System. The Circulatory System is composed of the heart and a 60,000 mile network of blood vessels reaching every part of the body. There are three types of blood vessels; arteries , veins , and capillaries Arteries are muscular, elastic vessels that carry blood away from the heart. Veins return blood to the heart. Capillaries are microscopically small vessels that contact the body's cells, exchanging nutrients, oxygen, and waste. The Heart
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2 The Heart is a strong muscle that pumps blood to all parts of the body. Located in the center of the chest behind the sternum (breastbone), the heart is shaped somewhat like a pear. In an average healthy adult it is about the size of a clenched C9:± Heart characteristics A located in the center of the chest A average weight 12 ozs. A Pumps 4-5,000 gal/day A Pumps 1 gal/min rest, 9 gal strained The heart beats approximately 60-100 times a minute (avg. =72) or about 100,000 times each day. In an average lifetime this amounts Most of heart is composed of strong
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CircSystem_heart - The Circulatory System & Heart Each...

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