PSY 2301 Chapter Notes - Chapter 9: Ventromedial Nucleus Of The Hypothalamus, Gastric Bypass Surgery, Paraventricular Nucleus Of Hypothalamus
14 Sep 2016
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Food intake is controlled by 2 complimentary drives. Homeostatic pathway :controls energy balance by increasing the motivation to eat following depletion of energy stores (regulatory behavior: non-homeostatic (hedonic) pathway: cognitive-based regulation of food intake can over-ride the homeostatic pathway (non-regulatory behavior) System variable: the characteristic to be regulated: set point: optimal value of the system variable, detector: monitors value of the system variable, correctional mechanism: restores the system variable to the set point. Mouth, stomach, intestine, gall bladder, pancreas, and anus. Three types of nutrients are extracted, each of which is a specialized form of energy reserve: Lipids (fats: amino acids (building blocks of proteins, glucose (sugar) Located in cells of the liver: filled with glycogen (an inert form of glucose) In the presence of insulin (secreted from the pancreas), cells of the liver convert glucose into glycogen. In the presence of glucagon, cells of the liver convert glycogen to glucose. Fasting phase: food is not available.
