bodily response to stress notes

this is notes on the SAM response and HPA response and the GAS by seyle.

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  • Created on: 30-04-12 21:03
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Psyc miss law.
Bodily response to Stress
stress is a stimulus which creates an in balance between what we perceive we can cope with and
the demands being made upon us.
Using memory we know what we think we can cope with and what we
perceive we cant cope with. The situation becomes a stressor when we
perceive we cant cope. This acitvates the hypothalamus and depending on
the type of stressor depends on the type of pathway activated next.
Acute stress (short term stressor) SAM response
known as the fight or flight response, this activates the sympathtic branch of the ANS (automatic
nervous system). The message of stress is then sent to the adrenal medulla in the adrenal gland
this releases adrenaline and noradrenalin which has wide spread effects on the body, such as:
· boost oxygen/heart rate
· heart rate
· increase clotting
· blood flow
suppress all non emergency bodily functions e.g. digestion.
Increases: heart rate
Breathing rate
Clotting factors
Blood flow.
Release of
And adrenalin
Inside Adrenal gland
Adrenal medulla

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Chronic stressor (long term stressor) HPA response
when the stressor continues over a longer period of time the hypothalamus actives the
hypothalamic-pituitary adrenal axis. The hypothalamus then stimulates the pituitary gland, this
secretes a hormone called adrenocorticotropic hormone (ACTH). This ACTH then stimulates the
adrenal gland, the adrenal cortex in particular, which then release a hormone called cortisol.…read more

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GAS General Adaptation Syndrome
this was created by Selye, he developed this theory by experimenting
on rats. He noted that no matter what experiment he subjected these
rats too they all responded in the same way. So due to all the
experiments being different he came up with the conclusion it was due
to a more general state he called stress. The rats went through 3 main
phases which he adapted to humans.…read more

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