In which condition is the heart muscle too weak to pump efficiently?
A) heart valve prolapse
B) congestive heart failure
C) myocarditis
D) endocarditis
B
Explanation: Congestive heart failure is a condition in which the heart muscle is too weak to pump efficiently. Heart valve prolapse occurs when the cusps or flaps are too loose. Myocarditis is inflammation of the muscle layer of the heart. Endocarditis is inflammation of the inner layer of the heart.
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