The Circulatory System
The circulatory system, also known as the cardiovascular system, is the combined function of the heart, blood, and blood vessels to carry oxygen as well as nutrients to organs and tissues all throughout the body and carry away waste products. When the body is under stress such as exercise, the circulatory system can increase blood flow to various organs and muscles to meet increased energy demands, and help to regulate body temperature. It also is involved with the immune system in fighting against an unknown or foreign substance that invades the body, by swiftly sending the disease fighting elements such as white blood cells and antibodies to the area under attack. Additionally, in the case of injury or bleeding, the circulatory system sends clotting cells and proteins to the affected area to stop blood loss. The circulatory system has three structural elements; the heart, blood and blood vessels. The circulatory system's engine is the heart, which is divided into four chambers: the right atrium, the right ventricle, the left atrium, and left ventricle. The walls of the heart are composed of muscle called myocardium. This muscle contracts and relaxes continuously to pump blood. Blood consists o
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Some common words found in the essay are:
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Approximate Word count = 854
Approximate Pages = 3 (250 words per page double spaced)
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