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Expiration involves

  • a)
    Relaxation of diaphragm and intercostal muscles

  • b)
    Contraction of diaphragm and intercostal muscles

  • c)
    Contraction of diaphragm muscles

  • d)
    Contraction of intercostal muscles

Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Expiration involvesa)Relaxation of diaphragm and intercostal musclesb)...
Expiration is a process by which the foul air (carbon dioxide) is expelled out from the lungs. It is a passive process which occurs in the diaphragm and internal intercostal muscles in the following manner-
i) Diaphragm: The muscle fibres of the diaphragm relax making it convex, decreasing the volume of tge thoracic activity.
ii) Internal intercostal muscles: These muscles contract so that they pull the ribs downward and inward decreasing the size of the thoracic activity. So, the correct answer is option (A) .
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Community Answer
Expiration involvesa)Relaxation of diaphragm and intercostal musclesb)...
Correct answer is option.a. Relaxation of diaphragm and intercostal muscles
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Expiration involvesa)Relaxation of diaphragm and intercostal musclesb)Contraction of diaphragm and intercostal musclesc)Contraction of diaphragm musclesd)Contraction of intercostal musclesCorrect answer is option 'A'. Can you explain this answer?
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