Physiological basis of cardiac cycle

Abstract

The heart is an organ located in the thoracic cavity between the lungs, behind the sternum and above the diaphragm. It consists of two pair of chambers (atria and ventricles) through which blood must circulate through in the heart. Blood moves first into the right atria then enters to the right ventricle through the tricuspid valve. Here the blood moves further through the pulmonary valve into the a.pulmonaris for the pulmonary circulation. Blood then returns to the left part of the heart through the pulmonary veins into the left atrium where it pushes through the mitral valve down to the left ventricle. From the left ventricle it moves through the aortic valve to the aorta where it goes to circulate through the rest of the body.