The "lubb" and "dupp" sounds you hear are made by the:

Question

Quizplus · Accepted Answer

The "lubb" and "dupp" sounds are made by the opening and closing of the heart valves. The "lubb" sound is made by the closing of the atrioventricular valves (mitral and tricuspid) at the start of ventricular systole, while the "dupp" sound is made by the closing of the semilunar valves (aortic and pulmonary) at the end of ventricular systole. Therefore, opening and closing of the heart valves is the correct answer.

The "Lubb" and "Dupp" Sounds You Hear Are Made by The