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Explain functioning of heart |
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Answer» The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.The heart has four chambers:\tThe right atrium receives blood from the veins and pumps it to the right ventricle.\tThe right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.\tThe left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.\tThe left ventricle (the strongest chamber) pumps oxygen-rich blood to the rest of the body. The left ventricle’s vigorous contractions create our blood pressure.The coronary arteries run along the surface of the heart and provide oxygen-rich blood to the heart muscle. A web of nerve tissue also runs through the heart, conducting the complex signals that govern contraction and relaxation. Surrounding the heart is a sac called the pericardium. The blood provides your body with the oxygen and nutrients it needs. It also carries away waste. Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs. |
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