Question

The first heart sound is

• A. ‘LUBB’ sound produced at the end of systole.
• B. ‘DUP’ sound produced at the end of systole.
• C. ‘LUBB’ sound produced at the beginning of systole.
• D. ‘DUP’ sound produced at the beginning of systole

Answer 1

Answer: (C)

Lub is the first heart sound, which is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole