lec 19 Flashcards
what is the diff bw euryhaline and stenohaline?
eury-: wide, while steno-: narrow
–> can handle wide range of solutes vs narrow range of solutes
how does counter current exchange work for O2 uptake? brine excretion?
as the blood gets ‘further out’ itll be more adept at taking up O2 conc
idk ask about this
urea phylogenies. explain
fish are found to synth and excrete urea
terre verts are more adapted for diff nitrogen compounds, like uric acid
– this trait likely came from fish
sharks are hyposmotic to ambient saltwater. how do they reconcile this?
- water is gained through osmosis over gills
- salt is gained by diffusion over gills
actually idk whats happening ask da prof
hyper-isosmotic regulators.
what da flip
can u acclimate to different salinities? if so, how?
u can! to do so, u moderate cotransporters at the epithelium (recruit way more MRR and transporters)
harder to acclimate to SW than FW (adapting to ions is easier than adapting to water)
what is anhydrobiosis? how do bdelloid rotifers do this?
anhydrobiosis is a process where u dessicate urself completely. bdelloid rotifers do this when fungi are at high conc and getting a little too much
how do grasshopper exoskeletons protect from water loss? what does the relationship look like when graphed?
idk the mechanism but the range stays pretty steady for the most part, at which point it completely doesn’t (exponential relationship)
how do we compare to amphibians in terms of water moving across the skin?
humans (and also mice) are relatively not that efficient compared to amphibians, which are pretty much one with their environment
as animals get larger, the rate of evaporative water loss increases. is this good or bad?
not necessarily either, just demonstrates that there are energy costs assoc
