The human heart, which is roughly the size and shape of a man’s closed fist, contains 4 chambers and 4 valves. The 4 chambers of the heart that divide its internal cavity into four regions are the right atrium, right ventricle, left atrium and the left ventricle. The atria constitute the upper chambers and the ventricles comprise the lower chambers. The two atria have thin walls and receive venal blood. Deoxygenated blood from the systemic veins is received by the right atrium. The left atrium receives blood which is oxygenated from the pulmonary veins. The two ventricles have thicker ...
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Right atrium temporarily carries deoxygenated blood from body tissues. It receives deoxygenated blood from the upper portion of the body via superior vena cava. In addition, deoxygenated blood from the lower portion of the body enters the right atrium via inferior vena cava. Upper portion of the body carries the head, neck, and other organs situated superior to the heart while lower portion carries legs and other body parts situated superior to the heart. As more blood enters the right atrium, it fills up. This makes its walls to contract causing pressure to build up. The pressure causes the ...
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