Human Heart: Structure and Working · NCERT Biology

Which of the following events occurs during 'Joint Diastole'?

  1. All four chambers are simultaneously relaxed
  2. Atria are contracting while ventricles relax
  3. Ventricles are contracting while atria relax
  4. Semilunar valves are wide open
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Correct answer: All four chambers are simultaneously relaxed

During joint diastole, all four chambers of the heart are in a relaxed state. The tricuspid and bicuspid valves are open, allowing blood to flow from the pulmonary veins and vena cava into the ventricles.

Difficulty: Medium Question 7 of 20

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