01:119:116 Lecture Notes - Lecture 28: Collecting Duct System, Reabsorption, Abdominal Wall
29 Apr 2016
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Document Summary
Metabolic waste- substances which at some point were in body cells/ participated in metabolism. Non- metabolic wastes are eliminated (feces) not excreted (urine) Osmoregulation: osmosis, h2o moves from hypoosmotic (hypotonic) to hyperosmotic (hypertonic- greater solute conc. ) Body fluids in osmotic equilibrium w/ surrounding h2o isosmotic. Live in h2o w/ stable composition: osmoregulators. Able to live in environments that are inhospitable for osmoconformers. Osmolarity is same as seawater but conc. of specific solutes different from sea h2o actively transport solutes: most vertebrates & some invertebrates- osmoregulators. Animal losing h2o drink large amounts of h2o. Eliminate ingested salts through gills & kidneys: freshwater animals- hyperosmotic relative to external environment, problem- gaining h2o & losing salts, drink very little h2o excrete large amounts of dilute solutions, terrestrial animals, dehydration, lose h2o. Urine: drinking h2o not freely available for many vertebrates, adaptations to reduce h2o loss. Lower temps & higher humidity lower evaporative h2o loss: replace h2o.
