Stress Flashcards
3 key characteristics of stress are….
- stress calls for action
- our body responds the same regardless of the type of stress
- can cause structural and physiological changes to our body (may be long term)
Adrenal Glands
- adjacent to kidneys
- medulla: inner
- cortex: outer
what do our adrenal glands to when activated by stess?
- move blood away from extremities and to core organs
- vasoconstrict = inc BP = inc HR
- open up lungs = inc o2
what is our adrenal medulla responsible for?
- releases epinephrine/norepnephrine (NRTMs)
- inc HR, BP
- lipolysis (more gluc = more energy)
- narrow veins
- open lungs (adrenaline)
- muscle glycogen –> muscle glucose (adrenaline)
what part of the NS is the adrenal medulla in? what is this part responsible for?
sympathetic NS
- alarm stage
- fight or flight
- short term
how does our ant pit contribute to our stress response?
secrete ACTH and beta- endorphins (pain)
- resistance stage
- sustained response
what is our adrenal cotex responsible for?
- long term stress
- synthesizes/secretes CORTICOSTEROIDS
what effect do glucocorticoids (cortisol) have?
- maintains high blood gluc levels to help brain fn and have enough energy to sustain F.O.F response
- breaks down fats for MORE energy
- suppresses immune fn and inhibit inflammatory response
- released during intense physical exercise
what effect does mineralocorticoids (aldosterone) have?
- maintain electrolyte balance
- reabsorb na/h2o in kidneys
- inc BV/BP
- release stimulated by dehydration, low na, blood loss
using a flow chart, explain how our body reacts to long term stress
stress/rhythm –> hyp –> CRH –> ant pit -> ACTH –> adrenal cortex –> cortisol –> inc blood gluc, a.a, f.a
what occurs in exhaustion stage?
- no more F.O.F
- long term effects of glucocorticoids
- prediabetic (long term blood gluc levs)
- lose muscle mass/strength
- impaired congnitive fn (memory, emotion, decision making)
