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Describe the structure and working o...

Describe the structure and working of the human heart .

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The heart is thick muscular organ located in the thoracic cavity . It is covered by a two layered sac called pericardium . The heart is four chambered with two aurciles and two ventricles .Right Auricle receives deoxygenated blood from superior and inferior vena cava and passes to rignt ventricles from right venticles impure blood passes to pulmonary artery and reaches the lungs .
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