PSYCH 1XX3 Lecture Notes - Lecture 12: Taste Bud, Saccharin, Amygdala
9 Mar 2016
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Introducion: feeding behaviors may be moivated by hunger and saiety signals, but are guided to a large extent by interacion of senses of taste and smell. Glucose and glycogen balance: glucose is the primary source of energy for the brain. Main reason for hunger is low blood glucose levels: eat->increase in blood sugar->pancreaic insulin secreion->uptake of glucose by cells- >ime goes on->decrease in blood sugar->liver converts glycogen to glucose->feels hungry. Npy (neuropepide y: high levels of npy acivity in hypothalamus associated with increased appeite and food seeking behaviors. Similar in ish, repiles, birds and other non-human mammals. Saiety and the liver: just like liver signals brain to trigger hunger, it signals brain to trigger saiety, low glucose/glycogen levels=hunger, high glucose/glycogen levels=saiety. Cck and meal duraion: as food is digested, small intesine produces cholecystokinin (cck), a hormone that is responsible for feeling of saiety ater a meal. Receptors in brain detect cck which serve as a signal to stop eaing.
