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The human heart is a muscular organ located in the thoracic cavity, slightly to the left of the midline. It is roughly the size of a fist and has a conical shape, consisting of four chambers: two atria on the upper side and two ventricles on the lower side. The right atrium receives deoxygenated blood from the body through the superior and inferior vena _______ _______ ________ ___ ________ _________ _______ _________ _____.
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