Valves of the heart open and close due to ________.
A) contraction of papillary muscles
B) timing sequences
C) electrical signals
D) pressure changes
E) None of the answers are correct.

Question

Quizplus · Accepted Answer

Valves of the heart open and close due to pressure changes. When the pressure on one side of the valve is greater than the pressure on the other side, the valve opens. When the pressure on the other side is greater, the valve closes. The pressure changes are caused by the contracting and relaxing of the heart muscle.

Valves of the Heart Open and Close Due to ________