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What is it? The response to an unpleasant and possibly threatening situation (stressor) where there’s a mismatch between how we perceive the demands and our ability to cope with them. STRESS. TWO TYPES OF STRESS. Acute (immediate): e.g Chronic (ongoing): e.g. . Acute stress.
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What is it? The response to an unpleasant and possibly threatening situation (stressor) where there’s a mismatch between how we perceive the demands and our ability to cope with them. STRESS
TWO TYPES OF STRESS • Acute (immediate): e.g • Chronic (ongoing): e.g.
Acute stress Sympathomedullary pathway • Activated without conscious control • Vital to survival • Adaptive response to dangerous or threatening situations • Fight or flight
Sympathomedullary pathway • Hypothalamus:Detects the need and alerts the – Pituitary gland: activates the bodily systems necessary for fight or flight Adrenal medulla: releases adrenaline
Sympathomedullary pathway • Works via the ‘autonomic nervous system’ (ANS) which has two divisions: SYMPATHETIC PARASYMPATHETIC NERVOUS NERVOUS SYSTEM SYSTEM
SNS Prepares the body for...
Arousal of the SNS = • Increased heart rate, respiration & blood pressure • Muscles are energised by sugars & fatty acids released into the bloodstream • Digestion slows down • Adrenal medulla stimulated by pituitary gland and releases adrenaline and noradrenaline and these keep the reaction going
PNS Acts to return the body to a state of normality
Chronic stress Pituitary adrenal system • Not for immediate survival but for continued energy production • Designed to work long term to help the body combat chronic stress by maintaining energy levels.
Pituitary adrenal system • Hypothalamus: Detects the need and Sends CRF to – • Pituitary gland: Sends ACTH to – • Adrenal cortex: Stimulates release of corticosteroids which in turn releases cortisol for more energy
Sympathomedullary pathway Pituitary-adrenal system