Question

Lubb-dup sound in heart arises due to:

• A. opening of semilunar, bicuspid and tricuspid valves
• B. closure of semilunar, bicuspid and tricuspid valves
• C. opening of tricuspid and bicuspid valves
• D. closure of bicuspid and tricuspid valves

Answer 1

Answer: (B)

The lubb - dup sound is produced due to closure of semilunar, bicuspid and tricuspid valves which prevents back flow of blood.