Figure 18-2
-What occurs at "B" on the graph?
A)semilunar valve opens
B)semilunar valve closes
C)AV valve opens
D)end-systolic volume

Question

Figure 18-2
-What occurs at "B" on the graph?
A)semilunar valve opens 
B)semilunar valve closes 
C)AV valve opens 
D)end-systolic volume

Quizplus · Accepted Answer

Point "B" on the graph represents the closure of the semilunar valves, which occurs at the end of ventricular systole when ventricular pressure drops below pressure in the aorta and pulmonary artery, causing the aortic and pulmonary valves to close.

Figure 18-2 -What Occurs at "B" on the Graph