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Of the Four "Normal" Heart Sounds,the Initial "Lubb" Sound Is

Question 57

Multiple Choice

Of the four "normal" heart sounds,the initial "lubb" sound is heard when the

A) AV valves close.
B) semilunar valves close.
C) AV valves open.
D) semilunar valves open.
E) foramen ovale closes.

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