Explain when and how the two sounds of heart are produced ?

1.	Explain when and how the two sounds of heart are produced ?
Answer» (i) ‘Lubb’ the first sound which is low pitched is caused by the closure of bicuspid and tricuspid valves. (ii) ‘Dup’ the second sound which is high pitched is caused by the closure of semilunar valves.

Answer»

(i) ‘Lubb’ the first sound which is low pitched is caused by the closure of bicuspid and tricuspid valves.

(ii) ‘Dup’ the second sound which is high pitched is caused by the closure of semilunar valves.

Discussion