L21 Respiratory system II

L21 Respiratory system II - Respiration II TERRESTRIAL AIR...

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Unformatted text preview: Respiration II TERRESTRIAL AIR PROBLEMS Lots of O2 but needs to be in solution to diffuse how to keep lungs moist with no excessive loss of water air saturated with water vapor, mucous conditions air first, not full exchange of air in a cycle stop collapse of lungs lots of internal septae, surfactant inherited lungs from fishes AMPHIBIANS Larvae have external gills, neotenous species retain them throughout life. external nostrils are valved all passages lined by cilia and secretory cells moisten and trap particles interior of lungs open, surface area increased by pockets respiration like lungfish except air enters through nares rather than mouth pharynx floor lowers, air through nares, glottis opens, stale air out of lungs by elastic recoil, contraction of hypaxial muscles esp transversus abdominis, air mixed, nares closed, buccal cavity raised, air into lungs, repeated until lungs well inflated. Skin of amphibians also a respiratory organ, depends on...
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This note was uploaded on 08/28/2011 for the course ZOO 3713c taught by Professor Staff during the Spring '08 term at University of Florida.

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L21 Respiratory system II - Respiration II TERRESTRIAL AIR...

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