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MCQ:

The "dub" sound is produced when

  1. atria are fully contracted
  2. atria start to relax
  3. after the semilunar valves are closed
  4. after the bicuspid and tricuspid valves suddenly close

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O Level Biology App (Android & iOS)

O Level Biology App (iOS & Android)

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College Biology App (Android & iOS)

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Molecular Biology App (iOS & Android)