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S_leve3 S_leve3
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Posts: 3311
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9 years ago
The S1 heart sound corresponds to which of the following physiological events?
A) Closure of the semilunar valves      B) Closure of the AV valves
C) Ejection of blood from the atria      D) The onset of relaxation
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milestone23milestone23
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9 years ago
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