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stressandemotionpsych121

stressandemotionpsych121 - Stress and Emotion Cannon...

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1 Stress and Emotion Cannon: Homeostasis Changes in the surroundings excite reactions in this system, or affect it directly, so that internal disturbances of the system are produced. Such disturbances are normally kept within narrow limits, because automatic adjustments within the system are brought into action, and thereby wide oscillations are prevented and the internal conditions are held fairly constant (Cannon 1929) Stress What is “stress”? “A multidimensional concept that includes the stress stimuli, the processing system (cognitive assessment of the stimuli) and the stress responses. “ your text “the rate of all the wear and tear caused by life” Hans Selye, 1956
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2 Selye’s classic stages 1) Alarm 2) Adaptation 3) Exhaustion Acute stress invokes the sympathetic nervous system Acute stress leads to increases in epinephrine and norepinephrine (amine hormones released by adrenal medulla). Note: different stressors can produce different stress responses. Functions of Epinephrine Increases heart rate Increases stroke volume Dilates arterioles in skeletal muscle Constricts arterioles in skin and digestive tract Increases catabolism of glycogen into glucose in liver Breakdown of lipids in adipose tissue
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3 Hypothalamic-pituitary- adrenal axis (HPA) The paraventricular nucleus of the hypothalamus releases CRH. CRH causes the anterior pituitary to release ACTH (adrenocorticotrophin hormone).
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  • Summer '08
  • HENRY

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