Heart - muscular, conical-shaped organ about the size of a closed fist,weighs approximately 9 ounces located in the chest cavity., Pericardium - Membrane that encloses the heart., Resting heart rate - normally beats about 72 to 80 times per minute, Right and Left Atrium - Also called auricle, upper, thin-walled chambers., Right and left ventricle - Lower thick-walled chambers., Valves - Allow blood to flow in only one direction, Atria - When heart contracts and relaxes, the blood flows in, travelingfrom the atria to the ventricles; it is then driven out to be distributed throughout the body.,

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