BIO 3302 Lecture Notes - Lecture 13: Crucian Carp, Facilitated Diffusion, Nephron

• School: University of Ottawa
• Department: Biology
• Course: BIO 3302
• Professor: Kathleen Gilmour

Document Summary

Lecture 13 & 14 osmoregulation/excretion introduction; aquatic environments. Osmoregulators vs osmoconformers: osmoregulators: maintains constant osmotic concentrations in the body fluids even as the environment changes, osmoconformers: matches the environment osmotic concentration. Refer to graph of medium osmotic concentration vs. The red line on 1000 (mosm) medium osmo- (cid:272)o(cid:374)(cid:272)e(cid:374)tratio(cid:374) sho(cid:449)s the (cid:272)o(cid:374)(cid:272)e(cid:374)tratio(cid:374) at (cid:862)sea water(cid:863) For fresh water, it is around 1 mosm 10 mosm. Artemia are regulators (have constant osmotic concentrations) Carcinus is neither a flat line or a conforming line. Palaemonetes (shrimp) is also neither a perfect regulator or conformer. Viviparus, tetrahymena, and anodonta are all regulators but cannot survive in anything other than fresh water (i. e. cannot withstand high saline environment; has high energetic cost) For balance to occur: water entry = water exit, salt entry = salt exit. This forces us to think about the routes where animals gain or lose water and salt. Example: fish: will lose/gain water and ions depending on the environment.