Question

Q. The first heart sound occur due to
a. Closure of tricuspid valve
b. Opening of semilunar valve
c. Closure of bicuspid valve
d. closure of semilunar valve
Choose the correct option---
1) a and c
2) b and c
3) b only
4) a and d​

Answer 1

Answer:

Here is the answer for your question:

4) a and d.

Explanation:

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Answer 2

$\bold{Answer\;: a\; and\; d}$

• The first heart sound “lub” is produced by closure of bicuspid (mitral) and tricuspid valves and opening of semilunar valves. This phenomenon is known as ventricular systole.

$\bold{Hope\;it \; helps\;!}$