The S1 heart sound corresponds to which physiological event?
1. Closure of the AV valves
2. Closure of the semilunar valves
3. Ejection of blood from the atria
4. The onset of relaxation
1
Rationale 1: S1 corresponds to the closure of the AV valves.
Rationale 2: Closure of the semilunar valves corresponds to S2.
Rationale 3: This sound is not associated with ejection of blood from just the atria.
Rationale 4: This sound is not associated with relaxation of the muscle.
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