The Lub sound is produced by closing 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 Lub sound is produced by closing of which valves?

Explanation:
The Lub sound marks the start of ventricular systole. It happens when the atrioventricular valves (the mitral and tricuspid valves) close as the ventricles contract and pressure rises. This rapid snap shuts the valves and the associated vibrations create the characteristic “lub.” The second heart sound, “dub,” comes later when the semilunar valves (the aortic and pulmonary valves) close at the end of systole as the ventricles relax. Opening of either set of valves wouldn’t produce these sounds in this normal sequence.

The Lub sound marks the start of ventricular systole. It happens when the atrioventricular valves (the mitral and tricuspid valves) close as the ventricles contract and pressure rises. This rapid snap shuts the valves and the associated vibrations create the characteristic “lub.” The second heart sound, “dub,” comes later when the semilunar valves (the aortic and pulmonary valves) close at the end of systole as the ventricles relax. Opening of either set of valves wouldn’t produce these sounds in this normal sequence.

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