The heart is a muscular four-chambered organ, which is responsible for pumping blood through the blood vessels of circulatory system.
Firstly, the blood enters into right atrium of the heart and then passes to right ventricle via tricuspid valve. <u>The right ventricle of the heart then contracts and pushes the blood to pulmonary artery via </u><u>pulmonary semilunar valve</u><u>.</u>
