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STRESS
REVISION

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STRESSORS are events that trigger the stress response in the body. They throw the body out
of balance and force it to respond. Stressors may be;
life changes (divorce/death)
daily hassles (traffic/lost keys)
workplace stressors (lack of control/role strain)
environmental stressors (noise/temperature/
overcrowding)



STRESS-

A lack of fit between perceived…

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The General Adaptive Syndrome (GAS) - Seyle


This is the model of how the stress response adapts physiological systems to a stressor.

According to Seyle, stress is adaptive in the short term because it enables us to cope with or adapt to environmental demands.
Prolonged stress, however, is very damaging…

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Autonomic Nervous System (ANS)
The ANS Regulates internal bodily processes, often without any conscious effort, this links to the heart, stomach and
intestines because they are smooth-muscled areas which cannot be voluntarily controlled.




Sympathetic Branch Parasympathetic Branch

Increased heart rate Decreased heart rate
Reduced activity in the Increased activity in…

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Sympathomedullary System (SAM)

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Creates physiological reactions. EG- Increased heart rate.

Getting the body ready for flight or flight

Adrenaline

Noradrenalin

Releases adrenalin

Stimulates the adrenal medulla

Hypothalamus

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Hypothalamic-pituitary-adrenal (HPA)

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CORTISOL

Adrenal gland ­

Adrenal Cortex

Adrenocorticotropic hormone (ACTH)

Pituitary gland-

Anterior pituitary

Hypothalamus

Stress and the immune system
The immune system is our main defence against infection by foreign agents




It is an immensely complicated network of cells and chemicals that functions to seek out and
destroy invading particles.…

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