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==Introduction==
==Introduction==
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[[Image:Doglungdeflated.jpg|right|thumb|200px|©RVC 2008]]
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[[Image:Doglungdeflated.jpg|right|thumb|250px|©RVC 2008]]
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[[Image:Doglunginflated.jpg|right|thumb|200px|©RVC 2008]]
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[[Image:Doglunginflated.jpg|right|thumb|250px|©RVC 2008]]
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]].
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]].