Stress & HPA axis - VCE U4 Psych

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This file accompanies a YouTube file - covering the HPA axis, the Fight-Flight response & the role of cortisol in the stress response. See www.ePsychVCE.com for link

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  • Stress helps performance
  • Hypothalamus, pituitary gland, Adrenalin
  • Cortisol released by Adrenal cortexAdrenalin/ noradrenalin released by adrenal medula
  • Released by HPA axis Crying reduces cortisol levels which explains why you feel better
  • Stress & HPA axis - VCE U4 Psych

    1. 1. Stress• Stress defined: Key descriptors1. physiological or psychological tension2. internal or external forces3. exceeding a persons resources for their ability to cope• Stress: involves both psychological & physiological changes• What’s good about stress?• What’s bad about stress?
    2. 2. Fight or Flight response• Definition: Key descriptors• automatic response• prepares animal• to confront - OR• flee• a physically or psychological threatening situation• It’s an adaptive response because?• Triggered by _____________ nervous system• Activates the HPA axis
    3. 3. HPA axis• Hypothalamus triggers the release of• CRH (Corticotrophin releasing hormone) which activates the• Pituitary Gland which releases the hormone• ACTH (Adrenocorticotropic hormone) which is carried by the blood to the• Adrenal gland which releases stress hormones• Cortisol/ Adrenalin and Noradrenalin• To assist the body deal with the stressor
    4. 4. Cortisol• Cortisol is a stress hormone• Aids metabolism of fats, proteins, carb’s & increases glucose levels in the blood providing additional energy for muscles• That is helpful in the short- term i.e. In the short term it acts to restore homeostasis• Harmful in the long-term (weakens the immune system)• It is released by the Adrenal Gland - but• Regulated by Pituitary Gland

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