What causes the semilunar valves to open?

What causes the semilunar valves to open?
  1. The ventricular pressure increase
  2. The closure of the tricuspid and bicuspid valves
  3. The relaxation of the ventricles
  4. The backflow of blood into the atria

Solution

As the ventricular pressure increases further, the semilunar valves are forced open.

Asked in: NCERT

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