College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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Which heart sound is associated with the closure of the AV valve?

The correct answer is: S1

The heart sound associated with the closure of the atrioventricular (AV) valves is the first heart sound, commonly referred to as S1. This sound occurs at the beginning of ventricular contraction (systole) when the ventricles are filled with blood and pressure builds up. The increased pressure forces the AV valves (the mitral and tricuspid valves) to close tightly to prevent the backflow of blood into the atria. The closure of these valves creates the distinct "lub" sound that characterizes S1. In contrast, the other heart sounds represent different events in the cardiac cycle. S2 corresponds to the closure of the semilunar valves at the end of ventricular systole, while S3 and S4 are associated with specific scenarios regarding ventricular filling and stiffness, often linked to heart failure or other cardiac conditions. Thus, the identification of S1 as the sound linked to the closure of the AV valves is critical for understanding normal heart function and the timing of cardiac cycles.