Auscultating the Heart Sounds Should Result in a "Lubb-Dupp" Sound

question 20

Multiple Choice

Auscultating the heart sounds should result in a "lubb-dupp" sound when using the bell and the diaphragm of the stethoscope. What causes the "lubb" sound?

• A) Opening of the AV valves
• B) Opening of the semilunar valves
• C) Closing of the AV valves
• D) Closing of the semilunar valves

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