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O Level Biology MCQs (O Level) From Textbook

O Level Biology MCQs – Certification Test 179

Heart: O Level Biology MCQ (Question 179) – App & e-Book Download

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MCQ 179: Back flow of blood from right ventricle to right atrium is prevented through:

  1. semilunar valves
  2. mitral valves
  3. tricuspid valves
  4. median septum

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