Human lungs - class-XI

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Multiple Choice

Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place? 

  1. Internal intercostal muscles relax and diaphragm contracts
  2. External intercostal muscles and diaphragm relaxes
  3. Internal intercostal muscles contract and diaphragm relax
  4. External intercostal muscles and diaphragm contract
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