BIOL 224 Lecture 3: osmo 3
Document Summary
Hey guys, i missed this lecture but did my best to use the powerpoint, friends notes and the textbook to put together the notes. If you have anything to add please do as these notes aren"t as comprehensive as if i had gone to the lecture. No compatible osmolytes: sharks maintain high [ ] of perturbing osmolyte: urea. The effect of urea is counteracted by trimethylamine-n-oxide (tmao) 2:1 ratio allows them to cancel each other out. Cancels each other out so molecules behave as they should. Sharks are isotonic with ocean so it isn"t worth it to fight osmotic pressure and swim up river, shrks that have the ability to osmoregulate so they so. In freshwater: 20% reduced nacl, 50% reduced urea. Still body fluids have double osmolarity than normal freshwater fishes. Massive urine production (250 ml / kg: 20 times more urine than in salt water.
