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Expiratory muscles contract at the time of
- a)Deep inspiration
- b)Normal inspiration and expiration
- c)Forceful expiration
- d)Normal expiration
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Expiratory muscles contract at the time ofa)Deep inspirationb)Normal i...
Expiration muscles come into action when you force expiration. The expiratory muscles are the abdominal muscles and intercostals. It is rare if a patient is contracting abdominal muscles for quiet breathing and he is trying to force expiration.
Most Upvoted Answer
Expiratory muscles contract at the time ofa)Deep inspirationb)Normal i...
Expiratory muscles contract during forceful expiration.
Explanation:
During normal breathing, the diaphragm and external intercostal muscles contract during inspiration, causing the rib cage to expand and the lungs to fill with air. During expiration, these muscles relax and the lungs passively recoil, forcing air out.
However, during forceful expiration (such as during exercise or coughing), additional muscles are recruited to actively contract and push air out more forcefully. These muscles include the internal intercostal muscles, which pull the ribs downward and inward, and the abdominal muscles, which compress the abdominal cavity and push the diaphragm upward, further increasing the pressure gradient for air to flow out of the lungs.
Therefore, expiratory muscles only contract during forceful expiration, while normal expiration relies mainly on passive recoil of the lungs.
Explanation:
During normal breathing, the diaphragm and external intercostal muscles contract during inspiration, causing the rib cage to expand and the lungs to fill with air. During expiration, these muscles relax and the lungs passively recoil, forcing air out.
However, during forceful expiration (such as during exercise or coughing), additional muscles are recruited to actively contract and push air out more forcefully. These muscles include the internal intercostal muscles, which pull the ribs downward and inward, and the abdominal muscles, which compress the abdominal cavity and push the diaphragm upward, further increasing the pressure gradient for air to flow out of the lungs.
Therefore, expiratory muscles only contract during forceful expiration, while normal expiration relies mainly on passive recoil of the lungs.
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Community Answer
Expiratory muscles contract at the time ofa)Deep inspirationb)Normal i...
Expiration muscles come into action when you force expiration. The expiratory muscles are the abdominal muscles and intercostals. It is rare if a patient is contracting abdominal muscles for quiet breathing and he is trying to force expiration.
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Expiratory muscles contract at the time ofa)Deep inspirationb)Normal inspiration and expirationc)Forceful expirationd)Normal expirationCorrect answer is option 'C'. Can you explain this answer?
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