Closure of which of the following makes ...

Closure of which of the following makes louder sound of heartbeat ?
1. Thebesian
2. Eustachian
3. Semilunar valves
4. Atrio-ventricular valves

A

Thebesian

B

Eustachian

C

Semilunar valves

D

Atrio ventricular valves

Verified by Experts

The correct Answer is:

D

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