What event creates the first heart sound?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What event creates the first heart sound?

Explanation:
The first heart sound comes from the closing of the atrioventricular valves (mitral and tricuspid) at the start of ventricular systole. When the ventricles begin to contract, pressure rises and forces these valves shut to prevent backflow into the atria, producing the characteristic “lub.” Opening of the aortic and pulmonary valves does occur during systole, but their opening does not generate this sharp sound. Ventricular contraction itself drives blood ejection, not the sound, and opening of the mitral and tricuspid valves happens during diastole when the ventricles fill.

The first heart sound comes from the closing of the atrioventricular valves (mitral and tricuspid) at the start of ventricular systole. When the ventricles begin to contract, pressure rises and forces these valves shut to prevent backflow into the atria, producing the characteristic “lub.” Opening of the aortic and pulmonary valves does occur during systole, but their opening does not generate this sharp sound. Ventricular contraction itself drives blood ejection, not the sound, and opening of the mitral and tricuspid valves happens during diastole when the ventricles fill.

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