Biology 2601A/B Study Guide - Final Guide: Glycogen, Relative Humidity, Tardigrade
20 Dec 2017
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Ionic (charges) and osmotic (distributions of water) properties are both important. Cell volume regulation: cells are optimized to be a certain size, cells are actually very crowded. If the cell gets too small, crowding becomes a problem. Fresh water fish: mosm - unit of osmotic concentration, the concentration of osmotic potential, 1 molecule has the same osmotic potential, regardless of what it is, measure of all the molecules in solution. Inside of fish - 300 mosm: made up primarily of sodium and chloride, outside - less than 5 mosm, low sodium and chloride. Inside more concentrated that outside: therefore net influx of water into the fish, and net efflux of salts. Fish wants to maintain constant concentrations: does(cid:374)(cid:859)t (cid:449)a(cid:374)t this i(cid:374)flu(cid:454) Inside - wet environment: high sodium and chloride relative to outside enviro, outside - dry relative to inside, gains them only through eating and drinking. Loose salts and water through urine and feces.
