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[[Image:Doglungdeflated.jpg|right|thumb|300px|©RVC 2008]]

[[Image:Doglungdeflated.jpg|right|thumb|200px|©RVC 2008]]

==Introduction==

==Introduction==

[[Image:Doglunginflated.jpg|right|thumb|300px|©RVC 2008]]

[[Image:Doglunginflated.jpg|right|thumb|200px|©RVC 2008]]

The lungs are the site for 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 inspiration and expiration.

The lungs are the site for 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 inspiration and expiration.

*The bulk of the lung consists of bronchi, blood vessels and connective tissue. The terminal bronchioles have alveoli scattered along their length, and are continued by alveolar ducts, alveolar sacs and finally alveoli.

*The bulk of the lung consists of bronchi, blood vessels and connective tissue. The terminal bronchioles have alveoli scattered along their length, and are continued by alveolar ducts, alveolar sacs and finally alveoli.

[[Image:Routeofairthroughrespiratorysystem.jpg|right|thumb|250px|'''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''']]

==Function==

==Function==