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colleen colleen
wrote...
Valued Member
Posts: 17077
11 years ago
The S1 heart sound corresponds to which of the following physiological events?
1. closure of the AV valves
2. closure of the semilunar valves
3. ejection of blood from the atria
4. the onset of relaxation
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wrote...
Valued Member
11 years ago
1 -- S1 corresponds to the closure of the AV valves. Closure of the semilunar valves corresponds to S2. These valves are not associated with ejection of blood from just the atria or relaxation of the muscle.
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