[RS] Q.4) Muscles of respiration:

Ans. 

Muscles of respiration: 

A ) In quite inspiration:

• The Diaphragm
• External intercostal muscle

B ) In force full inspiration:

• The diaphragm
• External intercostal muscle
• Sternoclidomastoid muscle
• Scaleni muscle
• Serratus anterior muscle
• Latismus dorsi muscle

C ) Muscles of expiration:
 
1) In quite expiration:
Doesn’t involve any muscles. It occurs due to-
Elastic recoil tendency of the lungs and chest wall and abdominal structures which compresses the lungs.

2) In force full expiration:
(Additional contraction of abdominal muscles)

• Rectus abdominas.
• Internal intercostalis.
• Serratus posterior inferior muscle.