BIO202H5 Lecture Notes - Lecture 4: Semipermeable Membrane, Osmoregulation, Extracellular Fluid
Document Summary
Bio202: lecture 4: ion & water balance: january 28, 2019. Ion balance in freshwater: hypertonic to its environment (osmolarity of body higher than in environment, body has more salts than in the environment, challenges, gaining h20 / risk of gaining too much h2o. Losing salts / risk of losing salt ions though diffusion: solutions, drink less or no h20, osmoregulate, excrete very dilute urine, actively transport salts through the gills. Osmotic solutions in freshwater: drink less or no h20, actively reabsorb salts, through the gills, through the proximal and distal convoluted tubule and the collecting duct, reabsorb less h20 due to. K+ leak into the cell: cl moves down concentration gradient, cl- concentration electrostatically pulls na+ outside, na+ and cl- lost via rectal gland, gills can change the movement of the cl- Osmotic solutions on land: salts and h20 from diet and drinking actively balance salts and h2o in the.
