PSYCH 1XX3 Lecture Notes - Lecture 2: Neuropeptide Y, Leptin, Blood Sugar

• School: McMaster University
• Department: Psychology
• Course: PSYCH 1XX3
• Professor: Joe Kim

Document Summary

Blood glucose levels regulate feeling of hunger and satiation. Glu(cid:272)ose is the pri(cid:373)ar(cid:455) sour(cid:272)e of e(cid:374)erg(cid:455) for the (cid:271)rai(cid:374) (cid:894)(cid:272)a(cid:374)"t use fat as e(cid:374)erg(cid:455)(cid:895) We have high sensitivity to blood glucose levels, which directly relates to feelings of hunger (low glucose = feelings of hunger) This glucose-glycogen balance is mediated by the liver and the pancreatic hormone, insulin. Glycogen stores help maintain blood glucose levels over the course of a day. Pancreas secretes insulin to promote the uptake of glucose by our cells: for immediate use, and, to stimulate storage of excess glucose as glycogen (excess stored as adipose) When glucose levels are low enough, the liver begins to breakdown stored glycogen into glucose, releasing back into circulation. The liver and pancreas help buffer extreme swings in blood glucose levels. When glycogen reserves decrease, a status single is sent to the brain. When the glucose and glycogen levels are too low, you feel hungry.