Hypothalamus is alerted. This recognises the stress isacuteso it activates theSympathomedullary(SAM) Pathway.
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This activates thesympatheticbranch of the Autonomic Nervous System (ANS).
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This then stimulates the adrenal medulla which is part of the adrenal gland. These are located just above the kidneys.
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The adrenal medulla secretes the hormones adrenalin and noradrenalin into the bloodstream.
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This prepares the body for fight or flight and as such causes a number of physical changes, including increased respiration rate, increased alertness and pupil dilation.
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The body cannot maintain this increased level of activity for long periods of time, as it takes too much energy. After a few minutes/when the stressor has been dealt with, theparasympatheticbranch of the nervous system is activated.
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This is a countershock response and serves to return the body back to its normal resting state (e.g. Reduces heart rate and breathing rate).
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