1. S1 sound:
Answer closure of AV valves
2. Where is S1 loudest:
Answer Apex
3. S2 sound:
Answer closure of semilunar valves
4. S2 sound is loudest at:
Answer Base
5. S1 split sound:
Answer Tricuspid and mitral valves closing asynchronously
6. S2 split sound:
Answer Aortic and pulmonic valves closing asynchronously
7. S3 sound:
Answer sound immediately before S2
8. S3 sound is due to:
Answer Ventricular resistance to filling during rapid filling phase
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