Exam (elaborations)
Barron's CCRN Review Test Prep.
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Barron's CCRN Review Test Prep. Describe normal heart sounds. - S1 - Lub - Caused by closure of AV valves - Loudest at apex of the heart (midclavicular, 5th intercostal space) - Marks end of diastole, beginning of systole S2 - Dub - Caused by closure of semilunar (aortic, pulmonic) valves...
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