Ncert Exercises & Solutions

Which among the followings is correct during each cardiac cycle?

1.	The volume of blood pumped out by the Right and Left ventricles is same
2.	The volume of blood pumped out by the Rt and Lt ventricles is different
3.	The volume of blood received by each atrium is different
4.	The volume of blood received by the aorta and pulmonary artery is different

(a) Cardiac Cycle consists of one heart beat or one cycle of contraction and relaxation of the cardiac muscle. The contraction phaseis called the systole while the relaxation phase is called the diastole.

The purpose of cardiac cycle is to effectively pump the blood. The right ventricle pumps the volume of deoxygenated blood to the lungs through pulmonary artery. After the oxygenation of blood the volume of blood carried through pulmonary vein is pumped through left ventricle into the aorta and transferred to the entire body.

This pumping of blood, is about the same and any mismatchin volumes ejected by the ventricles (i.e., right ventricle pump more blood than left or vice versa) can result in the heart failure. Thus, all the other option are wrong.

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