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

Answer: (C)

In figure $(2)$, blood is entering into the right auricle through superior and inferior vena cava and blood is entering into left auricle through pulmonary vein . Figure $(1)$ shows movement of blood from the auricles into the ventricles. Figure $(3)$ shows movement of blood from the right ventricle into the pulmonary artery and from the left ventricle into aorta.