Biology 3601A/B Lecture Notes - Lecture 3: Trimethylamine N-Oxide, Metabolic Waste, Deamination
21 Oct 2016
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Lecture 3 ion and water balance 1: nitrogenous waste. How to deal with extra nitrogen coming into the system. Ions: in via mouth (food, drinking), absorbed across epithelia (not much, even in the sea: epithelia: mouth, gills, skin, terrestrial animals are pretty waterproof, not absorbing everything through the skin. Water: in via mouth (+ some absorption) Ions: voided via kidneys (mammals), gill epithelia (bony fishes), specific glands (birds and reptiles) Water: voided/regulated via excretion (kidneys, gills, etc. : urine is more concentrated on a sunny day when you(cid:495)re dehydrated. Concentrating power of kidneys and glands: regulate the amount of water you lose by controlling how much water you excrete through kidney. Other physiological constraints: physiological constraints based on the type of waste products we produce. Co2 , water, steroids and hormones, nitrogenous wastes. Nitrogenous waste is one of the key components of urine. Metabolizing these proteins and then excrete the parts they don(cid:495)t want, which is often nitrogen.
