The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic semilunar valves.

Question

Quizplus · Accepted Answer

The "lub" sound, also known as the first heart sound (S1), is primarily associated with the closure of the mitral and tricuspid valves, not the pulmonary and aortic semilunar valves. The closure of the semilunar valves is associated with the second heart sound (S2), often described as the "dub" sound.

The "Lub" Sounds of the Heart Are Valuable in Diagnosis