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Slide 1

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SAM and HPA systems
AS Psychology, AQA A, unit 2-
biological (stress)…read more

Slide 2

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SAM system- acute stress
Sympathetic adrenal medulla:
· When a stressful event is encountered the
hypothalamus triggers the sympathetic branch of the
automatic nervous system (ANS), which is more active
when the body is stressed and using more energy.
· The sympathetic ANS stimulates the adrenal medulla
which produces the hormones; adrenaline and
noradrenalin in to the blood stream.…read more

Slide 3

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SAM system- acute stress
Adrenaline and noradrenalin effect the body by:
· Increasing heart rate
· Increasing blood pressure
· Increasing breathing rate
· Increasing sweating
· Decreasing digestion leading to dry mouth and nausea
The parasympathetic ANS returns the body to normal
after the acute stressor has passed
Continuous activation of the SAM system can lead to
CHD…read more

Slide 4

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HPA system- chronic stress
hypothalamic pituitary adrenal axis: When a chronic
stressor is experienced:
· The hypothalamus releases CRH which stimulates the
pituitary gland
· The pituitary gland then produces ACTH which
stimulates the adrenal cortex.
· The adrenal cortex then releases cortisol which gives
us energy by converting fat and proteins…read more

Slide 5

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HPA system- chronic stress
Cortisol has the following effects on the body:
· Steady long term supply of blood sugar
· Damages immune system…read more


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