AP Biology Notes

Digestive System By, Tina Stuart, Mac Rawson, Schuyler Mace and Joel Harris Energy Budget ? Food energy flow can be viewed as a 'budget' ? The production of ATP accounts for the largest fraction of use. ? ATP powers metabolism in endothermic animals which acts as thermoregulation ? ATP generation is based off of oxidation of organic molecules ? carbohydrates, proteins and fats (fats yielding most energy) ? Excess fuels are used to do biosynthesis ? used to grow in size or reproduction Energy Storage ? Liver and muscle cells store energy as glycogen ? Animals expend live glycogen first and then draw from fat cells. ? Most healthy people have enough stored fat to sustain them through several weeks of starvation. ? The average human's energy needs can be