Auscultating the heart sounds should result in a "lubb-dupp" sound when using the bell and the diaphragm of the stethoscope. The "lubb" sound is caused by the:
a. opening of the AV valves.
b. opening of the semilunar valves.
c. closing of the AV valves.
d. closing of the semilunar valves.
C
The "lubb-dupp" sound of the heart is caused by the closing of the AV and semilunar valves, respectively.
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