Motivation maintanance of homeostasis reduces stress motivation energizes behaviors and gives it direction basic motivation hunger thirst sleep sex us directed towards helping maintain our internal balance homeostasis stimulation of lateral hypothalamus animals will start eating stimulation of ventromedial hypothalamus ventro lower medial middle animal stops eating sation center Hypothalamus Hunger Neurophysiology Obesity defined as 30 above normal body weight 25 of americans are obese More men than women More lower than upper class genetic contribution if both parents 70 risk for children if one parent 40 neither parent 10 Set point theory body weight is set at birth and body tries of maintained Defined as extreme and voluntary weigh loss at least 15 below normal weight Obsessed with food and weight loss little or no insight Anorexia Nervosa Distorted body image Female male 20 1 Prevalence rate 1 Begins teens 30s Imbalance in electrolyte balance can lead to cardiac arrhythmias urinary infections loss of teeth Bulimia Nervosa Typically have normal body weight Eating binges followed by purges Closelt associated with depression Prevelance 5 10 percent Diathesis stress model of eating disorders Sexuality Sex biological definition xx xy Biology has greater influence after puberty Turner syndrome one x chromosome Gender behavioral cultural and psychological trait associated with one sex Klienfelder syndrome xxy tall staured no facial hair and development of breast
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