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Ventilation - Anatomy & Physiology (view source)
Revision as of 12:38, 13 August 2008
, 12:38, 13 August 2008no edit summary
*During Inspiration, the pressure within the [[Pleural cavity and membranes - Anatomy & Physiology|Pleural Cavity]] drops to less that the pressure of the external environment.
*During Inspiration, the pressure within the [[Pleural cavity and membranes - Anatomy & Physiology|Pleural Cavity]] drops to less that the pressure of the external environment.
*This is achieved by increasing the lung volume, brought about by the Inspiratory Muscles:
*This is achieved by increasing the lung volume, brought about by the Inspiratory Muscles:
**[[Diaphragm - Anatomy & Physiology|Diaphragm]] - flattens
**[[Diaphragm - Anatomy & Physiology|Diaphragm]] - contracts - causing the dome to flatten and moe caudally.
**[[Intercostal Muscles - Anatomy & Physiology|Intercostal muscles]]
**[[Intercostal Muscles - Anatomy & Physiology|Intercostal muscles]] - External Intercostal Muscles contract - causing the ribs to be pulled outwards cranially.
==Function==
==Expiration==
During Expiration, the pressure within the [[Pleural cavity and membranes - Anatomy & Physiology|Pleural Cavity]] increases to greater than that of the external environment, in orfer to expel air from the lungs. This is achieved by decreasing the lung volume, caused by relaxation of Inspiratory Muscles:
**Dome of the Diaphragm is pushed back by the intrathoracic pressure.
**Ribs recoil to origin position.
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