Question

The figure given below shows three stages in the cardiac cycle. Which of the following sequences is correct regarding this?

• A. 2,3,1
• B. 1,2,3
• C. 2,1,3
• D. 3,1,2

Answer 1

The correct option is B 1,2,3

The correct answer is B.

Every single heartbeat includes three major stages, atrial systole, ventricular systole, and complete cardiac diastole.

1) Atrial systole is the contraction of the atria that causes ventricular filling.

2) Ventricular systole is the contraction of the ventricles in which blood is ejected into the pulmonary artery or aorta, depending on side.

3) Complete cardiac diastole occurs after systole. The blood chambers of the heart relax and fill with blood once more, continuing the cycle.