A nurse is explaining to a client the physiology of the heart with reference to the cardiac valves. Which statement by the client about the function of the cardiac valves demonstrates the correct understanding of the nurse's explanation?
A) Contract with sufficient force to pump blood
B) Act as receiving centers for blood
C) Divide the heart into right and left sides
D) Allow blood to flow in one direction only
D
Feedback:
The cardiac valves are one-way flaps of tissue that open and close in response to pressure changes within the chambers. These unidirectional valves allow blood to flow in one direction only, preventing backflow. The cardiac valves do not contract with sufficient force to pump blood; that is the function of the left ventricle. The atria heart chambers are receiving centers for blood. A complete muscular wall called the septum divides the heart into right and left sides.
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