PSYCH 1XX3 Study Guide - Final Guide: Opioid Receptor, Neuropeptide Y, Orexigenic
21 Mar 2017
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Introduction: hunger and satiety cycles throughout the day, many signals and complex interactions btw the brain an digestive system that drive your feelings of hunger. Glucose and glycogen balance: you feel hungry because of low glucose levels. Satiety and liver: liver can send signals to the brain that trigger satiety, the liver monitors glucose levels to control hunger and satiety, low glucose/glycogen levels = hunger, high glucose/glycogen levels= satiety. Long-term energy storage: fat is a form of long-term storage, animals need to consider more than current nutritional needs, whenever possible, long-term energy storage takes place, both short-term and long-term interact to regulate energy balance and body weight. If left unregulated, fat storage increases and the mice become obese: can be reversed if mice are given regular injections of leptin. Conclusion: our physiology guards us against weight loss, more so than weight gain.
