PSYC 2307 Lecture Notes - Lecture 7: Ghrelin, Blood Sugar, Mesolimbic Pathway
20 Apr 2016
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Document Summary
Eating and drinking is referred to as ingestive behaviours. This process is driven by physiological mechanisms that establish and control homeostasis. In humans, ingestive behaviours are controlled by a variety of processes involving many brain areas. Homeostasis: any process that maintains body chemistry within optimal limits to allow for the complex metabolic activities of the living organisms (cell, tissue, organ and whole body) Examples of these homeostatic processes affecting eating and drinking include; body temp (36. 5c), blood ph (7. 365), blood glucose, cellular oxygen/carbon dioxide content, blood pressure. Monitored substance or state of a condition: ex. Blood levels of glucose, amino acids and fatty acids, ghrelin: mechanisms for detecting the level of monitored substance or state of a condition, ex. Obtained midterm exam grade: example of hunger. Cns, liver, pancreas, hepatoportal vein, intestine, oral cavity, etc. Set point: ideal level of substance/condition, ex. Comparator: calculates the difference between monitored substance/condition level and ideal substance/condition level (negative feedback, ex.
