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Which muscles are employed when generating maximal inspiratory or expiratory pressures and how does this vary...

Which muscles are employed when generating maximal inspiratory or expiratory pressures and how does this vary during quiet tidal breathing?

Science   Anatomy-And-Physiology   
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Answer #1
  • The muscles of inspiration cause expansion of chest and increase the elastic coil of chest wall.This makes the intrapleural pressure more negative that helps in expansion of lungs due to which the air is sucked in.
  • The inspiratory muscles are divided into two categories : primary muscles are : The diaphragm and external intercostal muscles. Secondary muscles are : scalenes,sternocleidomastoid,muscles of upper respiratory tract etc.
  • When inspiration ends,the inspiratory muscles relax,the rib cage drops and the thoracic volume decreases.The elastic coil of lungs is now unopposed,which helps lungs to deflate.this results in expiration.
  • The Expiratory muscles are : Abdominal muscles,The internal intercostals,Neck and back muscles.
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