Changes

==Inspiration==

==Inspiration==

During Inspiration, the pressure within the [[Pleural Cavity and Membranes - Anatomy & Physiology|pleural cavity]] drops to less than the pressure of the external environment. This is achieved by increasing the [[Lungs - Anatomy & Physiology|lung]] volume, brought about by the Inspiratory Muscles. The [[Diaphragm - Anatomy & Physiology|diaphragm]] contracts, causing the dome to flatten and move caudally. The [[Ribs and Sternum - Anatomy & Physiology#Thoracic Musculature|external intercostal muscles]] contract, causing the [[Ribs and Sternum - Anatomy & Physiology|ribs]] to be pulled outwards cranially.

During Inspiration, the pressure within the [[Pleural Cavity and Membranes - Anatomy & Physiology|pleural cavity]] drops to less than the pressure of the external environment. This is achieved by increasing the [[Lungs - Anatomy & Physiology|lung]] volume, brought about by the inspiratory muscles. The [[Diaphragm - Anatomy & Physiology|diaphragm]] contracts, causing the dome to flatten and move caudally. The [[Ribs and Sternum - Anatomy & Physiology#Thoracic Musculature|external intercostal muscles]] contract, causing the [[Ribs and Sternum - Anatomy & Physiology|ribs]] to be pulled outwards cranially.

==Expiration==

==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 order to expel air from the [[Lungs - Anatomy & Physiology|lungs]]. This is achieved by decreasing the lung volume, and is brought about by relaxation of inspiratory muscles. The dome of the [[Diaphragm - Anatomy & Physiology|diaphragm]] is pushed back by the intrathoracic pressure and the [[Ribs and Sternum - Anatomy & Physiology|ribs]] recoil back to their original position.

During expiration, the pressure within the [[Pleural Cavity and Membranes - Anatomy & Physiology|pleural cavity]] increases to greater than that of the external environment, in order to expel air from the [[Lungs - Anatomy & Physiology|lungs]]. This is achieved by decreasing the lung volume, and is brought about by relaxation of inspiratory muscles. The dome of the [[Diaphragm - Anatomy & Physiology|diaphragm]] is pushed back by the intrathoracic pressure and the [[Ribs and Sternum - Anatomy & Physiology|ribs]] recoil back to their original position.

==Species Differences==

==Species Differences==

[[Category:Respiratory System - Anatomy & Physiology]]

[[Category:Respiratory System - Anatomy & Physiology]]

[[Category:To Do - AimeeHicks]][[Category:To Do - Review]]

[[Category:A&P Done]]