Human heart is one of the wonderful creature .Its working is wonderful.As we know our heart is so small in size but it supplies blood to all our body parts without any break . Although it works even we are sleeping.Human heart beats 72times in 60sec.The muscles of heart are called as cardiac muscles which works restlessly .Our heart is four chambered having two auricles and two ventricles.Heart is situated slightly toward left hand side.Between auricle and ventricle there is present auricoventricular apurture. Although artery carries oxygenated blood and veins carries deoxygenated blood .But pulmonary artery carries deoxygenated blood and pulmonary vein carries oxygenated blood.Pulmonary word is  used for lungs.Heart is having superior Vena Cava carried deoxygenated blood from upper body parts and inferior Vena Cava carried deoxygenated blood from lower body parts to the right side of our heart.

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