Physiology – MCQ 5 – Which of the following is true about fourth heart sound ‘S4‘ :

Which of the following is true about fourth heart sound ‘S4‘ :
A. Can be heard by the unaided ear
B. Frequency is greater than 20 Hz
C. Heard during ventricular filling phase
D. Heard during ventricular ejection phase

Correct answer : Heard during ventricular filling phase

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