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STRESS

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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STRESS

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  1. 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

  2. TWO TYPES OF STRESS • Acute (immediate): e.g • Chronic (ongoing): e.g.

  3. Acute stress Sympathomedullary pathway • Activated without conscious control • Vital to survival • Adaptive response to dangerous or threatening situations • Fight or flight

  4. Sympathomedullary pathway • Hypothalamus:Detects the need and alerts the – Pituitary gland: activates the bodily systems necessary for fight or flight Adrenal medulla: releases adrenaline

  5. Sympathomedullary pathway • Works via the ‘autonomic nervous system’ (ANS) which has two divisions: SYMPATHETIC PARASYMPATHETIC NERVOUS NERVOUS SYSTEM SYSTEM

  6. SNS Prepares the body for...

  7. 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

  8. PNS Acts to return the body to a state of normality

  9. 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.

  10. 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

  11. Sympathomedullary pathway Pituitary-adrenal system

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