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Respiration in Non-Homeotherms - Anatomy & Physiology (view source)
Revision as of 15:30, 30 October 2011
, 15:30, 30 October 2011→Gills
Gills are in the walls of both sides of the [[Pharynx - Anatomy & Physiology|pharynx]] and are composed of filaments which increase the surface area.
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. A '''countercurrent exchange''' system is in place within the gills to make gaseous exchange more efficient.
When a fish breaths, it takes in water into the mouth, which is then forced out through the gills. A '''countercurrent exchange''' system is in place within the gills to make gaseous exchange more efficient.
The gill has several important functions in fish physiology: '''respiration, nitrogenous excretion and fluid balance''' regulation.
The anatomic structure of the gills helps in its functions by providing a '''large and very thin surface'''. The gill filaments are divided into multiple finger-like projections, the primary lamellae, which in turn are divided into secondary lamellae.
There is usually very little mucus on the gill surface.
==Amphibia==
==Amphibia==