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Class 9 Biology Learning Guide: Certification Test 1026

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MCQ: 1026

Considering the cardiac cycle, the sound "lub" is produced when the

  1. atria contracts
  2. atria relax
  3. ventricles relax
  4. ventricles contract
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Pulmonary and Systemic Circulation Learning Guide: Class 9 Biology App & eBook MCQs

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