bio- chap 41

bio- chap 41 - I. Nutritional Requirements A. Hetertrophs...

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I. Nutritional Requirements A. Hetertrophs 1. fuel for all cell work in body 2. organic raw material to use in biosynthesis (carbon skeletons to make their own molecules) 3. essential nutrients (subs an animals cannot make) B. Homeostatic Mechansism manage an animal’s fuel 1. chem EG from oxidation of organic molecules 2. glucose- major fuel of cells, and its metabolism, regulated by hormone action, is an imp. Aspect of homeostasis – storage of fat, etc. 3. feedback mechanisms to regulate fat storage and use in mammals a. leptin hormone - high lvls cues the brain to depress appetite and increase EG consuming muscular activity and body heat production - loss of body fat = decrease in leptin lvls- increase appetite and weight gain 4. blood glucose level a. glucose and monomers absorbed into blood from digestive tract b. if lvl of gluc.in blood rises above a certain pt, pancreas secrete insulin into blood which enhances transport of gluc. Into body cells and stimulates the liver and muscle cells to store glucose as glycogen c. below a certain pt, pancreas secrete glucagon that opposes effect of insulin, promosotes breakdown and release of gluc. Into blood
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This note was uploaded on 02/25/2012 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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bio- chap 41 - I. Nutritional Requirements A. Hetertrophs...

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