Bio 117 WVU

Osmoregulation - The control of water balance and solute composition Nitrogenous waste - Formed by the breakdown of proteins and nuclei acids, toxic ammonia is produced Directly excreted - Toxic, needs lots of water, most invertebrates and fresh water fish Waste converted to urea - Low toxicity, requires ATP, turtles mammals marine fish amphibians Waste converted to Uric acid - Relatively nontoxic, largely insoluble in water, birds Four nephron parts - Renal corpuscle, proximal tu...