Related Experiment Video
Updated: May 16, 2026

14:05
Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
Published on: January 23, 2017
[Does modern speech audiometry belong in the assessment process?]
1Klinik für Ohren-, Nasen-, Hals- und Gesichtschirurgie, UniversitätsSpital Zürich, Frauenklinikstr. 24, 8091, Zürich, Schweiz. rudolf.probst@usz.ch
HNO
|December 11, 2012
Summary
No abstract available in PubMed .
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S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.
