Question

During Cardiac cycle, closure of___________ valves makes dull sound called 'DUB'​

Answer 1

Answer:

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole. The heart tone “dub,” or S2 (a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

Answer 2

Answer:

The first "lub"-"dub"

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