The semilunar valves are found

  1. in the vena cava
  2. at the base of the aorta and pulmonary artery
  3. between atria and ventricles
  4. in capillaries
Answer

B) at the base of the aorta and pulmonary artery

Semilunar valves guard the arteries leaving the heart. O Level Biology · Topic 11 Transport in Humans · 11.2 Heart

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