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
Many people with coronary artery disease do not experience symptoms. When the obstruction is bad enough, however it may cause angina pectoris which is characterized by chest pain that feels like something is squeezing or compressing the chest during exertion. It happens when the heart's oxygen demands cannot be met because of the blocked coronary artery. Rest relieves the pain, or sometimes it becomes necessary to take a medication called nitroglycerine. Nitroglycerine acts by dilating the coronary vessels, and allowing more blood to flow through. A myocardial infarction is also called a heart attack. This occurs when a coronary artery is completely occluded. When deprived of oxygen, that portion of the myocardium will die. When a large portion of the myocardium dies, the heart will fail as a pump, and the person will die. The first few hours after a heart attack are the most important because abnormal heart rhythms may occur. Symptoms of a heart attack are: Uncomfortable pressure, fullness, squeezing or pain in the center of the chest that lasts more than a few minutes, or goes away and comes back, pain that spreads to the shoulders, neck or arms, chest discomfort with lightheadedness, fainting, sweating, nausea or shortness of breath. Heart attac
Some common words found in the essay are:
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Approximate Pages = 3 (250 words per page double spaced)
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