Muscle Analysis of Ventilation

Muscle Analysis of Ventilation - Muscle Analysis of...

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Muscle Analysis of Ventilation Inspiration Diaphragm is responsible for 1/3 of the air exchange Scalenes and external intercostals are active during quiet inspiration In addition, the following muscles are also active during forced inspiration (for example, during heavy exercise): o sternocleidomastoid o serratus posterior superior o levatores costorum o quadratus lumborum o erector spinae o pectoralis major and minor Expiration Quite expiration requires no muscle action. It is a passive return from inspiration. Active forced expiration (for example, during heavy exercise) involves these muscles: o rectus abdominus o transverse and oblique abdominals o The abdominal muscles all have their proximal attachment on the ribs. When they contract and pull on the ribs they will pull the front of the ribcage down. Because of the fact that the ribs are hinged at the vertebrae, pulling down on the front of the ribs will cause chest depth to be reduced (ribs moving toward the spine as
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Muscle Analysis of Ventilation - Muscle Analysis of...

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