heart is a major muscular organ for our body.it is situated in left side and bounded by thoracic cage.it is the major circulari system, which is called cardiovascular system.our whole blood purified by two lungs and purify blood circulated by heart at the medium of pressure. then blood spreaded whole body by vascular system.it has some valve,if they are infected heart can't work properly.heart is passing through some electrical change which is recorded by electrocardiogram(ecg).by ecg we can know any abnormality of heart.our normal heart rate 72beats/min.
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