PSYC 1000 Lecture Notes - Lecture 16: Psych, Nucleus Accumbens, Endocannabinoid System

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

Document Summary

Drives: a state of internal tension that motivates behavior that will reduce the tension. To get out of this state is a positive thing. Homeostasis: a state of physiological equilibrium the body strives to maintain. Espo(cid:374)se s(cid:455)ste(cid:373) (cid:894)eat / (cid:272)o(cid:374)(cid:448)ert stored e(cid:374)erg(cid:455)(cid:895) to fi(cid:454) the . Internal state (energy level) which is registered (cid:271)(cid:455) the se(cid:374)sor repeats negative feedback loop. Mechanical: stomach (sensor) relays to brain that it is full. Blood glucose levels decrease: liver converts stored nutrients to glucose, and hypothalamus triggers hunger. Blood glucose levels increase: liver stops converting stored nutrients to glucose, and hypothalamus stops triggering hunger. Obesity can be caused by mutations that affect leptin production or reception (although not very common). In response to: nothing, is instead proportional to the total body fat. Pyy/cck: cause short term suppression of hunger between meals. Leptin: cause long term suppression in response to abundance of stored energy. Homeostasis: occurs when energy in = energy out.