PNB 2250 Lecture Notes - Lecture 13: Respiratory Quotient, Electron Acceptor, Enzyme
3 Oct 2016
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Essential for maintenance of homeostasis and growth. Energy is needed to work against entropy: all food is ultimately oxidized. Why we respire: food intake should equal energy needs. Availability is always an issue: regulated by the central nervous system (cns) blood components, digestive system. Nutrition: not the number of calories but the type of calories. % of protein, lipids, sugars: non-caloric components. Mammals= 0. 37 cal/g/hour: caloric requirements vary, associated costs. Digestion and reabsorption consumes between 12% and. All animals need proteins in their diets: proteins are normally recycled and replaced. Wear and tear: all essential amino acids are common to all animals. Plants can produce all amino acids: all animals must ingest lipids. Great deal of structural variability for essential lipids. Great variability in % of daily caloric and nutritional requirements. Not all animals can consume the same lipids: all animals consume sugars. Sugar is the best possible fuel except for the lack of nitrogen: some exceptions:
