The First Heart Sound Is Heard Just After the QRS

question 35

Multiple Choice

The first heart sound is heard just after the QRS on an electrocardiogram.The heart sound is caused by

• A) blood filling the cups of the semilunar valves
• B) turbulence in the blood from AV valves closing
• C) turbulence in the blood from semilunar valves closing
• D) chordae tendineae pulling AV valve cusps into correct position

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