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Unformatted text preview: Dr. Gleason Chapter 41 Animal Nutrition Needs Satisfied by Diet o Fuel for cellular work (chemical energy) o Organic materials to synthesize molecules o Essential nutrients (substances that cannot be made) Fuel o Where are excess calories stored? Liver and muscle Glycogen (a series of glucose molecules bound together; upwards of 10,000 molecules) Fats not broken down as easily as glycogen Hitting the Wall: around 20-22 miles in a marathon, body uses up all glycogen then starts using fats as an energy source o Metabolic order Liver Glycogen Muscle Glycogen Fat Figure 41.3 Homeostatic Regulation of Cellular Fuel o Homeostasis: 90mg glucose/100 mL blood o Too much sugar in blood liver produces insulin o Too little sugar in blood liver produces glucagon Why do we crave fatty foods? o Ancestors were hunter/gatherers o Meat was uncommon o Gorging on fatty foods was favored because it allowed survival through famines Organic Materials o...
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