Multiple choice

The sounds in the heart are created by

  1. contraction and relaxation of auricles and ventricles

  2. valves which regulate the flow of blood in the heart

  3. pericardium

  4. SA node

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Various valves present at the inlet and outlet of ventricles regulate the flow of blood in heart. Action of these valves creates the heart sounds.