Which of the Following is a Function of a Valve

Question

Which of the following is a function of a valve?
A) Regulates the direction of the flow of blood through the heart
B) Regulates the amount of oxygen bound to hemoglobin
C) Regulates heart rate
D) Directs the movement of the cardiac impulse

Accepted Answer

Valves in the heart regulate the direction of blood flow by opening and closing in response to pressure changes in the heart.

Answer: D
 Valves in the heart also direct the movement of the cardiac impulse by preventing backflow of blood and ensuring that blood flows in the correct direction.