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Human: The heart (Latin, cor) is a hollow organ made of muscle that pumps blood through the circulatory system by rhythmic contractions that repeat continuously. Cardiac means related to the heart, from the Greek word cardia for heart. The heart is one of the vital organs in the human body that plays a role in the circulatory system.\n\nHeart Function\nThe work of the heart is carried out through a continuous and repetitive mechanism also known as the cardiac cycle so that visually or known as heartbeat. Through an alternating mechanism, the heart contracts to empty its contents and relaxes to fill with blood.