Question

What are heart sounds? How are they produced?

[Review question: Pg. No: 215]

Answer 1

1. The rhythmic closure and opening of the valves cause the sound of the heart.
2. The first sound LUBB is of longer duration and is produced by the closure of the tricuspid and bicuspid valves after the beginning of ventricular systole.
3. The second sound DUPP is of a shorter duration and produced by the closure of semilunar valves at the end of ventricular systole.