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Title
HEART.heart, organ that serves as a pump to circulate the blood #236216199
Description
humans and other mammals and in birds, the heart is a four-chambered double pump that is the centre of the circulatory system. In humans it is situated between the two lungs and slightly to the left of centre, behind the breastbone it rests on the diaphragm, the muscular partition between the chest and the abdominal cavity.