2- The Physiological Stress Response Flashcards
What did Walter Cannon do ?
Come up with the idea of a fight-or-flight response
what happens in the face and head with a fight or flight response ?
saliva flow decreases
eye pupils dilate
what happens in the skin with a fight or flight response ?
blood vessels constrict, chills, sweating
what happens in the lungs during a fight or flight response ?
quick, deep breathing (bronchodilation)
what happens in the stomach and intestines during a fight or flight response ?
output of digestive enzymes decreases
bowel movements slows
so vessels in muscle areas dilate or constrict in fight or flight ?
dilate
explain Hans Selye’s General Adaptation Syndrome and its three phases
1) alarm reaction
2) resistance: continued exposure to stress
3) exhaustion (adrenal failure)
what does Selye’s theory say about how we handle stress in the modern age ?
we have adapted our physiological responses to deal w physical stressors but not mental stressors
what is the PNS’ role
maintain homeostasis through release of Ach
responsible for energy conservation and relaxation
in fight or flight response, which structure in the brain is stimulated ?
hypothalamus
what are the four components of the endocrine system ?
glands
hormones
circulation
target organs
what are the three glands most involved w stress response ?
pituitary
adrenal
thyroid
Explain the hypothalamic–pituitary–adrenal axis
hypothalamus sends CRH to pituitary, ACTH to adrenal, releasing cortisol, from there negative feedback loop back to hypothalamus
who is more of a stress hormone, cortisol or NE/E ?
all of them
what does cortisol do to BP
stabilizes it
