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The Mammalian Heart and Circulatory System
Member rating: No Rating | Words: | Submitted: Tue Aug 26 2003
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The Mammalian Heart and Circulatory System The heart is a muscular structure that contracts in a rhythmic pattern to pump blood. Hearts have a variety of forms: I am going to look at the mammalian heart which is comprised of four chambers. The heart is the centre of the cardiovascular system. On average the heart beats over 100 000 times a day and pumps 3780 litres of blood through 100 000 kilometres of blood vessels. The circulatory system functions in the delivery of oxygen, nutrient molecules, and hormones and the removal of carbon dioxide, ammonia and other metabolic wastes. It also helps to maintain fluid balance, regulate body temperature, and it assists in the defence of the body against invading microorganisms. Mammals have a double circulatory system: a pulmonary system, which carries blood between the heart and lungs, and a systemic system, which carries blood between the heart and the rest...
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