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MCAT Question A Day - 6/12/13

The two sounds associated with the cardiac cycle (“LUBB-dupp”) are heard in sequence when the valves of the heart close during ventricular systole and ventricular diastole, respectively. Which valves produce the first sound?

A.  Tricuspid valve and bicuspid valve
B.  Pulmonary semi-lunar valve and aortic semi-lunar valve
C.  Tricuspid valve and pulmonary semi-lunar valve
D.  Bicuspid valve and aortic semi-lunar valve

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