The human heart like other vertebrates is a muscular,contractile structure.The cardiac muscles of the heart are capable of strong contraction which brings about the circulation of blood through out the body.
The mammalian heart is two way pumps in one.The mammalian heart has four chambers two atria and two ventricle.The right atria pumps the blood in to the right ventricle which in turn pumps blood into the pulmonary arteries.from lungs the oxygenated blood is carried to left atrium through pulmonary vein.From left ventricle which in turn pumps blood into the aorta the systemic circulation.Thus there are two pumps working simultaneously in the single pumping organ the heart.
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