PSY-B - Psychology PSY-B 356 Lecture 14: B356Spring17Lecture14outline
8 Mar 2017
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Set point: normal level of body weight for an individual; is consistently maintained. Obesity = an elevated setting of the body weight set point ( fatostat ; lipostat) The body resists weight gain and weight loss. All bodily processes --> use energy, release heat calorie: quantity of heat required to raise the temperature of 1 g of water 1o c. Factors that affect metabolic rate: exercise, thyroid hormone. Thyroid gland releases thyroxine ---> increases metabolic rate (rate of almost all chemical reactions in all cells); lack of thyroxine ---> abnormally low bmr, obesity: sympathetic nervous system stimulation. Release of norepinephrine increases metabolic rate in all tissues. How metabolic rate is measured: oxygen utilization (correlated with calories) Memory: trigger for hunger is how long since last meal; amnesic patients will eat a second meal right after finishing a meal. Learning (instrumental conditioning): as children, praised for eating, punished for not eating result, less sensitive to nutrient content of diet.
