Working as a pumping system, the heart works well with valves to avoid the reverse stream of blood. Veins returns deoxygenated blood to the heart, which goes through the right atrium, bypasses into the right ventricle, and from there is driven out to the pulmonary artery on the approach to the lungs. The process is little bit changed in case of oxygenated blood. In this case, while returning from the lungs blood enters the left atrium passing through the pulmonary veins, surpasses into the left ventricle, and is then expelled out to the aorta. In the frontal surveillance of the heart, the right atrium, left atrium, right ventricle, and left ventricle are blue, yellow, purple, and red in color respectively. The halls seem to be semi-transparent.

The pumping stroke starts with the synchronized narrowing of both atria. This reduction serves to offer a supplementary thrust to acquire the blood into ventricles. This pumping cycle is called "diastole." It is followed by the beginning of next cycle “systole”. The aortic and pulmonary valves unbolt and blood is effectively expelled out from the ventricles, even as the mitral and tricuspid valves shut to avoid backflow. At the same time, the atria start to fill with blood again to follow up the cycle diastole and systole. It should be considered that equivalent volumes are driven out from the right and the left heart. The left ventricle produces a much higher pressure than does the right ventricle.

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