The first heart sound (S1) is produced by the closure of which valves?

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Study for the Ivy Tech Anatomy and Physiology II Heart Test. Access flashcards and multiple choice questions, each with helpful hints and explanations. Prepare effectively for your exam and bolster your understanding of heart anatomy and physiology!

Multiple Choice

The first heart sound (S1) is produced by the closure of which valves?

Explanation:
S1 marks the start of ventricular systole and is produced when the ventricles contract and the atrioventricular valves (mitral and tricuspid) snap shut. This closure creates the familiar “lub” sound as it prevents backflow into the atria. Opening of these valves is a silent event that occurs during filling, not during the sound we hear as S1. The semilunar valves close later, at the end of systole, producing the second sound “dub.” So the first heart sound comes from the closure of the atrioventricular valves.

S1 marks the start of ventricular systole and is produced when the ventricles contract and the atrioventricular valves (mitral and tricuspid) snap shut. This closure creates the familiar “lub” sound as it prevents backflow into the atria. Opening of these valves is a silent event that occurs during filling, not during the sound we hear as S1. The semilunar valves close later, at the end of systole, producing the second sound “dub.” So the first heart sound comes from the closure of the atrioventricular valves.

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