PSYC 1000 Lecture Notes - Lecture 15: Orexin, Ghrelin, Leptin

• School: University of Guelph
• Department: Psychology
• Course: PSYC 1000
• Professor: Dan Meegan

Document Summary

Drives states of internal tension that motivate behaviour to reduce the tension. Hungry, horny, thirsty, tired, lonely, poor, dirty, cold, hot, in danger, etc. A state of physiological equilibrium that the body strives to maintain. Ex. body energy regulation: kind of like indoor temperature regulation but for biology control center: brain response system: eat (and convert stored energy) Internal state: energy sensor: gut and brain control center: brain etc. Where is the control center in the brain? sensors. Mechanical stomach and intestinal distention [you only have a limited amount of room in your stomach, so if you overeat, your stomach will hurt] chemical. Peptide hormones/neurotransmitters [pyy, ghrelin, leptin, orexin, insulin, When blood glucose levels decrease liver converts stored nutrients to glucose. When blood glucose levels increase liver stops converting stored nutrients. Pyy released from the large intestine in response to food intake received in the hypothalamus, and the result is decreased hunger.