The nurse identifies the "LUBB" sound of the "LUBB/DUBB" of the cardiac cycle as the sound of the:
a. AV valves closing.
b. closure of the semilunar valves.
c. contraction of the papillary muscles.
d. contraction of the ventricles.
ANS: A
The LUBB is the first sound of a low pitch heard when the AV valves close.
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