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