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==Fish==
 
==Fish==
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Fish live in a relatively dense and viscous fluid, which has little oxygen carrying capacity. In order to gain sufficient gaseous exchange for survival, fish have developed a highly efficient system which has a large surface area, and utilises energy - the gills.
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Fish live in a relatively dense and viscous fluid, which has little oxygen carrying capacity. In order to gain sufficient [[Gas Exchange - Anatomy & Physiology|gaseous exchange]] for survival, fish have developed a highly efficient system which has a large surface area, and utilises energy - the gills.
    
===Gills===
 
===Gills===
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Gills are in the walls of both sides of the pharynx and are composed of filaments which increase the surface area.
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Gills are in the walls of both sides of the [[Pharynx - Anatomy & Physiology|pharynx]] and are composed of filaments which increase the surface area.
 
When a fish breaths, it takes in water into the mouth, which is then forced out through the gills.
 
When a fish breaths, it takes in water into the mouth, which is then forced out through the gills.
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'''Aquatic''' amphibians may also have ''internal gills'' and '''Pharyngeal Slits'''.
 
'''Aquatic''' amphibians may also have ''internal gills'' and '''Pharyngeal Slits'''.
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Most Amphibia also have lungs for breathing. This contains interconnecting septa which divide the lumen into '''Faveoli''', compartments which open into a central chamber within each lung.
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Most Amphibia also have lungs for breathing. This contains interconnecting septa which divide the lumen into '''Faveoli''', compartments which open into a central chamber within each [[Lungs - Anatomy & Physiology|lung]].
    
==Reptiles==
 
==Reptiles==
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