The four-chambered heart found in mammals and birds is more efficient than the one, two, or three-chambered hearts found in some other animals.Scientists have had some success replicating the heart’s pumping action with artificial pumps, but these pumps can be rejected by the body, and they break down over time.Rarely, however, heart disease can also occur due to a virus or bacterium that infects the heart or its protective tissues. Cholesterol can build up in the arteries as a person gets older, and this is more likely for people who have diets high in saturated fat and cholesterol.
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