BIO202H5 Lecture Notes - Lecture 4: Guanine, Osmosis, Water Conservation
Document Summary
Provide an example: terrestrial, limited water resources cannot dessicate (cannot lose water, must have constant supply of water, water conservation of primary importance in filtration mechanisms, filtration system specialized to conserve water (loop of. Henle in nephron: osmoregulators: maintain constant body fluid osmolality despite environment, functional problem: deal with water conservation. In structural perspective: evolve: any animal living in terrestrial environments are osmoregulators, cannot equalize own water and salt balance with environment, osmoregulators help deal with this issue. Not enough salt available: higher concentration of solutes wrt environment, animal is hyperosmotic outside, risk of losing salt ions through diffusion, risk of too much water entering the body (osmosis, water elimination of primary importance in filtration mechanisms. Increased filtration surfaces (glomerulus) to keep more salts; increased dilution surfaces (distal tubules) to eliminate excess water) Which of the following is a characteristic of animal membrane: cell wall that resists tension.
