Question

The heart sounds are produced due to closure of tri and bicuspid valves

Answer 1

lub sound is produced due to closure of tri and bicuspid valves

Answer 2

Hey mate,here is your answer :

The closure of the AV valves is heard as lub, the firstheart sound (S1). The closure of the SL valves is heard as dub, the secondheart sound (S2).
Hope this answer helps you !!!