Define cardiac regurgitation
A) Cardiac regurgitation is the flow of blood from the ventricles into the outflow vessels.
B) Cardiac regurgitation is the flow of blood back into the right and left atria from the veins.
C) Cardiac regurgitation is the flow of blood into the ventricles during atrial contraction.
D) Cardiac regurgitation is the backflow of blood into the atria when the ventricles contract.
E) Cardiac regurgitation is the backflow of blood into the ventricles from the outflow vessels when the ventricles relax.
Answer: D
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