BIOL-UA 12 Lecture 13: Lecture 13
31 May 2016
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Document Summary
Lecture 13: osmoregulation and excretion: osmoregulation: regulation of solute concentrations and balances the gain and loss of water. Excretion: getting rid of nitrogenous metabolites and other waste products: osmolarity: Determines the movement of water across a selectively permeable membrane. If two solutions are isoosmotic, water molecules will cross the membrane at equal rates. Mobilizing solute can be used to equilibrate solutions. Solute can move from one side of membrane to another, either passively or actively: osmoregulation: Control of movement of solutes between internal uids and external environment. Salmon live in both salt and fresh water. In salt water, higher osmolarity than in body. Adaptations to reduce water loss are key to survival on land. Desert animals have anatomical and behavioral characteristics that can reduce their water loss: water balance: Gain salt and water by swallowing sea water. Osmotic loss of water through gills and other body surfaces. Osmotic gain of water through gills and other body surfaces.
