BIO310H5 Study Guide - Midterm Guide: Sodium Chloride, Teleost, Tonicity
Document Summary
Organism in freshwater- water moves in and salt moves out. Most of these organisms have hyperosmotic and it is fresh water environment so less solutes, so they have a challenge that water will go across the gills and so don"t have to drink water. Their challenge is not to have too much water in them because water goes through their gills anywhere. So they don"t want to get more water: weddell seals have dives that last an hour or longer, during the dive lactate could accumulate in the seals blood leading to a change in ph. This doesn"t happen until seals come to resurface. Lactate acid is not in blood because of ph so blood movement through tissues flushes out: descending limb is permeable to water but not ions such as. If it was permeable to nacl, would the bottom be hyperosmotic. Normally water is the only thing that exists, but if it is permeable to.
