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  • The muscle not involved in expiration is  Option: 1 Pectoralis minor   </p

The muscle not involved in expiration is

 

Option: 1

Pectoralis minor 

 


Option: 2

Abdominals

 


Option: 3

Quadratus lumborum

 


Option: 4

Internal intercostals

 


Answers (1)

best_answer

 

 

Mechanism of Breathing: Expiration -

Muscles of Expiration:

  • Core muscles:
    • Internal intercostal muscles: These contract to pull the ribs down.
    • Diaphragm: It relaxes to reduce the thoracic cavity.
  • Accessory muscles:
    • Abdominals: These contract to compress the abdomen.
    • Quadratus lumborum: These contract to pull the ribs down.
       

 The muscles involved in expiration are

Hence, the correct option is a. Pectoralis minor 

Posted by

Suraj Bhandari

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