Heart, muscular pumping organ, Blood, circulating medium, Blood Vessels, closed system (arteries, veins, capillaries), Right Atrium, receives oxygen-poor blood from the vena cavaEarth's outermost layer, Septum, muscle that divides the heart into four chambersOther term for plate, Ventricle, pumping chambers that force blood out of the heart, Atria, Receiving chamber, Valves, flaps of muscles that prevent blood from back flowingDenser plate, Semilunar, located at the bases of the large vessels leaving the ventricles, Arteries, convey oxygen-rich blood away from the heart.

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