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[[Image:Doglunginflated.jpg|right|thumb|200px|©RVC 2008]]
 
[[Image:Doglunginflated.jpg|right|thumb|200px|©RVC 2008]]
 
[[Image:Routeofairthroughrespiratorysystem.jpg|right|thumb|200px|'''Schematic Diagram showing the route air takes through the respiratory system''']]
 
[[Image:Routeofairthroughrespiratorysystem.jpg|right|thumb|200px|'''Schematic Diagram showing the route air takes through the respiratory system''']]
The lungs are the site for [[Gas Exchange - Anatomy & Physiology|gaseous exchange]], and are situated within the thoracic cavity. They occupy approximatley 5% of the body volume in mammals when relaxed, but generally have no fixed size or shape since their volume is constantly changing with the processes of [[Ventilation - Anatomy & Physiology#Inspiration|inspiration]] and [[Ventilation - Anatomy & Physiology#Expiration|expiration]].
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The lungs are the site for [[Gas Exchange - Anatomy & Physiology|gaseous exchange]], and are situated within the thoracic cavity. They occupy approximately 5% of the body volume in mammals when relaxed, and their elastic nature allows them to expand and contract with the processes of [[Ventilation - Anatomy & Physiology#Inspiration|inspiration]] and [[Ventilation - Anatomy & Physiology#Expiration|expiration]].
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The lungs, along with the [[Larynx - Anatomy & Physiology|larynx]] and [[Trachea - Anatomy & Physiology|trachea]], develop from a ventral respiratory tract. After separation from the developing [[Oesophagus - Anatomy & Physiology|oesophagus]], two lung buds develop, which undergo divisions as they grow, forming the beginnings of the [[Bronchi and bronchioles - Anatomy & Physiology|bronchial]] tree. This process is not completed by [[Parturition - Normal Parturition - Anatomy & Physiology|parturition]].
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The lungs, along with the [[Larynx - Anatomy & Physiology|larynx]] and [[Trachea - Anatomy & Physiology|trachea]], develop from a ventral respiratory tract. After separation from the developing [[Oesophagus - Anatomy & Physiology|oesophagus]], two lung buds develop, which undergo divisions as they grow, forming the beginnings of the [[Bronchi and bronchioles - Anatomy & Physiology|bronchial]] tree. This process is not completed at the time of [[Parturition - Normal Parturition - Anatomy & Physiology|parturition]].
    
==Structure==
 
==Structure==
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==Species Differences==
 
==Species Differences==
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* Externally the lungs of the '''Horse''' show almost no lobation. Internally the right lung of the horse lacks a Middle Lobe.
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* The lungs of the '''Horse''' show almost no lobation, and the right lung of the horse lacks a Middle Lobe.
 
*The lungs of '''Ruminants''' and '''Pigs''' are obviously lobed.
 
*The lungs of '''Ruminants''' and '''Pigs''' are obviously lobed.
 
*The fissures between lobes (''Interlobar fissures'') are deeper in the dog and cat lung compared to other species.
 
*The fissures between lobes (''Interlobar fissures'') are deeper in the dog and cat lung compared to other species.
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