Multiple choice

The opening of truncus arterisus in frog is guarded by

  1. three semilunar valves

  2. two semilunar valves

  3. one semilunar valve

  4. four semilunar valves

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A Correct answer
Explanation

The truncus arteriosus in frogs is guarded by three semilunar valves that prevent backflow of blood into the ventricle during ventricular relaxation. These valves are similar to the semilunar valves (aortic and pulmonary) in the human heart and ensure unidirectional blood flow from the single ventricle to the arterial system.

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