1. Tardigrade
  2. Question
  3. Biology
  4. Read the following statements and choose the correct option: A. The first heart sound (lub) is associated with the closure of both semilunar valves. B. The duration between the adjacent second heart sound and first heart sound is 0.3 seconds C. The cardiac output is the stroke volume multiplied by the number of heartbeats per minute.

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Read the following statements and choose the correct option:
A. The first heart sound (lub) is associated with the closure of both semilunar valves.
B. The duration between the adjacent second heart sound and first heart sound is 0.3 seconds
C. The cardiac output is the stroke volume multiplied by the number of heartbeats per minute.

NTA AbhyasNTA Abhyas 2022

Solution:

The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves, which occurs at the beginning of ventricular systole of a cardiac cycle.
The duration between the adjacent second heart sound (dub) and first heart sound (lub) is 0.5 seconds.