Ch 44 Osmoregulation_Excretion

Ch 44 Osmoregulation_Excretion - Chapter 44 Osmoregulation...

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Chapter 44 Osmoregulation and Excretion
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Fig. 44-2 Selectively permeable membrane Net water flow Hyperosmotic side Hypoosmotic side Water Solutes
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Osmoregulation - the control of the concentration of body fluids. Diffusion - movement of substance from an area of greater concentration to an area of lower concentration Osmosis - diffusion of water through a semipermeable membrane
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Adaptation to Marine Environment Reducing salt Seabird and marine iguana- nasal salt secreting gland Sea snake- sublingual gland Crocodile- lacrimal gland Fish gills- chloride cells Shark- rectal gland
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Salt Excretion in Birds
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Nitrogenous Waste Excretion Ammonia- toxic - Excrete directly into water- jellies - Detoxify urea Urea- need lots of water to get rid of Uric Acid- birds & reptiles - more costly to produce than urea, but needs less water to be removed
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Strategies to remove Nitrogenous Waste
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Osmoconformer: isoosmotic Osmoregulator: hyper-, hypo-, ureoosmotic Euryhaline: wide tolerance range
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This note was uploaded on 04/20/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Ch 44 Osmoregulation_Excretion - Chapter 44 Osmoregulation...

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