BIOL 2200 Lecture Notes - Lecture 33: Uric Acid, Amniote, Seed Predation
17 Apr 2017
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Nitrogenous waste: waste product from using protein and nucleic acids and breaking them down, can be toxic (ammonia), so must be removed, may take different forms to remove toxicity. 3 types of nitrogenous waste: ammonia (hydrogen added to nh2) Made with low energetic cost: urea. Toxic and must be diluted to be excreted from body safely. Produced in many land animals: uric acid. Doesn"t dissolve in water, reducing excretory water loss. Reptiles, birds, insects: general trend: the more complex the molecule, the less toxic but more energy required. What determines nitrogenous waste: type of nitrogenous waste based on: Environment (aquatic animals produce ammonia, land animals produce urea and uric acid) Immediate environment of egg: shell-less vs. amniotic egg: amount of nitrogenous waste. Seals are endotherms (energetically costly) and eats protein, producing lots of waste. Body fluid contacts membrane of an excretory tubule. Water, small solutes cross membrane to form filtrate: reabsorption.
