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- The heart is a hollow muscle that pumps blood throughout the blood vessels by repeated, rhythmic contractions. It is found in all animals with a circulatory system (including all vertebrates). The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek ÃŽÂºÃŽÂ±ÃÂÃŽÂ´ÃŽÂ¹ÃŽÂ¬, kardia, for "heart".