PSYC 375 EXAM 8 QUESTIONS AND
CORRECT ANSWERS!!
what happens to the temp neurons when the body is hot (over 37C)?
warm sensitive neurons: increase of activity
cold sensitive neurons: inhibited
what happens to the temp neurons when the body is cold?
warm sensitive neurons: decrease in activity
cold sensitive neurons: less inhibited, activates sympathetic nervous system to increase temp
how do fevers occur
pyrogens (anything to get you to have a fever) stimulate the release of prostaglandin E2, which
binds to warm-sensitive neurons and lowers their acitivty, resulting in less inhibition of cold-
sensitive neurons which acitvates the sympathetic nervous system and increases body temp
hunger (orbital frontal cortex, lateral hypothalamus, ventromedial hypothalamus,
when to start/stop eating is a complex behaviour that is modulated on several levels
orbital frontal cortex
- receives input from all sensory modalities
- part of mesolimbic reward pathway
- activation of opioid receptors mediate satiation
lateral hypothalamus
- initiation of eating
- damage
- stimulate parasympathic system
- stimulated by lower available glucose and leptin
, ventromedial hypothalamus
- satiety
- provides set point for when to stop
- stimulate sympathetic system
- stimulated by higher glucose and leptin levels
describe the association between eating disorders and hypothalamus
hypothalamus is the biological "thermometer" that monitors and maintains homeostatis
in individuals with anorexia and bulimia
- there is a greater connection between prefrontal cortex and striatal reward centers
- less connection between prefrontal cortex and hypothalamus
- overriding of homeostatic drives
difference between "liking" - reward structures and "wanting" - drive pathway
both include:
- midbrain and pons, nucleus accumbens, basal ganglia
reward structures (liking)
- also includes orbital frontal cortex, insula, and hedonic feeling of the activity
drive pathway (medial forebrain bundle - wanting)
- includes mesolimbic pathway, amygdala, prefrontal cortex
- motivation, urges
- normally activated by eating and sexual behaviours
posterior pituitary function, and its relationship with the hypothalamus
oxytocin and vasopressin from the hypothalamus is released as hormones in the posterior
pituitary
anterior pituitary function, and its relationship with the hypothalamus
CORRECT ANSWERS!!
what happens to the temp neurons when the body is hot (over 37C)?
warm sensitive neurons: increase of activity
cold sensitive neurons: inhibited
what happens to the temp neurons when the body is cold?
warm sensitive neurons: decrease in activity
cold sensitive neurons: less inhibited, activates sympathetic nervous system to increase temp
how do fevers occur
pyrogens (anything to get you to have a fever) stimulate the release of prostaglandin E2, which
binds to warm-sensitive neurons and lowers their acitivty, resulting in less inhibition of cold-
sensitive neurons which acitvates the sympathetic nervous system and increases body temp
hunger (orbital frontal cortex, lateral hypothalamus, ventromedial hypothalamus,
when to start/stop eating is a complex behaviour that is modulated on several levels
orbital frontal cortex
- receives input from all sensory modalities
- part of mesolimbic reward pathway
- activation of opioid receptors mediate satiation
lateral hypothalamus
- initiation of eating
- damage
- stimulate parasympathic system
- stimulated by lower available glucose and leptin
, ventromedial hypothalamus
- satiety
- provides set point for when to stop
- stimulate sympathetic system
- stimulated by higher glucose and leptin levels
describe the association between eating disorders and hypothalamus
hypothalamus is the biological "thermometer" that monitors and maintains homeostatis
in individuals with anorexia and bulimia
- there is a greater connection between prefrontal cortex and striatal reward centers
- less connection between prefrontal cortex and hypothalamus
- overriding of homeostatic drives
difference between "liking" - reward structures and "wanting" - drive pathway
both include:
- midbrain and pons, nucleus accumbens, basal ganglia
reward structures (liking)
- also includes orbital frontal cortex, insula, and hedonic feeling of the activity
drive pathway (medial forebrain bundle - wanting)
- includes mesolimbic pathway, amygdala, prefrontal cortex
- motivation, urges
- normally activated by eating and sexual behaviours
posterior pituitary function, and its relationship with the hypothalamus
oxytocin and vasopressin from the hypothalamus is released as hormones in the posterior
pituitary
anterior pituitary function, and its relationship with the hypothalamus
