During which phase do the AV and semilunar valves close and the first heart sound is heard, with ventricular pressure rising but no volume change?

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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

During which phase do the AV and semilunar valves close and the first heart sound is heard, with ventricular pressure rising but no volume change?

Explanation:
During isovolumetric contraction, the ventricles begin to contract with all valves closed. The AV valves shut first, producing the first heart sound, while the semilunar valves are still closed, so ventricular pressure rises but there is no change in volume. When the ventricular pressure finally exceeds the pressure in the great arteries, the semilunar valves open and ejection begins.

During isovolumetric contraction, the ventricles begin to contract with all valves closed. The AV valves shut first, producing the first heart sound, while the semilunar valves are still closed, so ventricular pressure rises but there is no change in volume. When the ventricular pressure finally exceeds the pressure in the great arteries, the semilunar valves open and ejection begins.

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