question_answer

The given graph shows pressure changes in the left side of the heart during a single heartbeat. Between points W and X, which of the following valves are open or closed respectively?

A)

Atrio-ventricular vaves	Semilunar valves
Closed	Closed

B)

Atrio-ventricular vaves	Semilunar valves
Closed	Open

C)

Atrio-ventricular vaves	Semilunar valves
Open	Closed

D)

Atrio-ventricular vaves	Semilunar valves
Open	Open