Chapter 9 Flashcards
(56 cards)
motivation
a specific need, desire, or want that energizes goal directed behavior
instinct
inborn goal directed behavior tendency that is characteristic of a species
William James about instinct
claimed that humans have instincts, early 1800s
drive-reduction theory
motivated behavior is aimed at reducing a state of tension or arousal and returning the organism to homeostasis
arousal theory
organisms seek optimal level of arousal
Yerkes-Dodson law
optimal level of arousal for best performance of a task. less complex tasks need less arousal
intrensic motivaiton
engaging in tasks for personal interest and enjoyment
extrensic motivation
motivation of outside source
lateral hypothalamus
tells us when we’re hungry by measuring glucose levels
ventromedial hypothalamus
tells when you’re full
paraventricular nucleus
influences desire to eat a specific food
how many days can you go without food
20-30
how many days can you go without water
3
anorexia demographic
90% middle to upper class young women
symptoms of anorexia
distorted body image, self-starvation, extreme weight loss, fears obesity even while losing weight
anorexia diagnosis
25% loss of ideal body weight
bulimia demographic
99% middle to upper class young women
bulimia symptoms
“binge and purge”; reocurant episodes of binge eating high caloric foods in short period of time (<2 hours) before inducing vomiting. inconspicuous eating
muscle dysmorphia
in young men, focus on working out and dieting
body dysmorphic disorder
belief there is something wrong with a specific part of appearance, usually a facial feature
why do we sense thirst
lack of water decreases blood flow to the kidneys and signals to the brain to drink
hyponatremia
drinking too much water so oxygen and carbon dioxide cant exchange; < 135mEq/L
how long does it take water to reach the cells
15 minutes
what organ measures water
large intestine
