PNB 2250 Lecture Notes - Lecture 21: Marine Invertebrates, Osmoregulation, Euryhaline
21 Oct 2016
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Permeable or not: blood osmolarity (300 to 100 mosm/l, osmoregulatory organs. Aquatic organisms: gills are a site of water and solute movement with the environment, gills possesses aquaporin channels. Specifically allow water to move down concentration gradient. Also have solute-specific membrane channels or pumps: aquatic animals cannot prevent the movement of water or solutes through the gills. Impermeable skin (for most: no gills, accelerated water loss through lungs, cannot be controlled or stopped, drinking water and solutes, desiccation is key obstacle. Evolution of osmoregulation: affected by changing ocean osmolarity, affected by the movement to land, affected by the need to build more complex animal structures. Loss complex regulation of water and solutes. More complex regulation of water and solutes. Expends the energy to exists in a wide range of osmolarities even with gills: stenohaline. Non-tolerant of osmolarity changes: osmoregulators vs. osmoconformers.
