HLSC 1F90 Lecture Notes - Lecture 2: The Strongest, Allostatic Load, Sympathetic Nervous System
27 Jan 2018
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Document Summary
Stressors are situations or events that trigger physical and emotional reactions which are perceived to be stressful: the physical or emotional reactions to a stressor is known as a stress response. Stressors: can be positive of negative, positive = eustress, getting married, negative = distress, getting fired, a consistent physiological response occurs in the human body: general adaptation. Stage 1: alarm: fight or flight; instantaneous, activates the autonomic nervous system, ans comes from the cns that regulates involuntary processes, composed of sympathetic and parasympathetic nervous system, sympathetic nervous system: Immediately hypothalamus stimulates adrenal glands to release epinephrine: epinephrine, higher heart rate, greater blood volume, greater muscle strength, better visual and auditory acuity. Long term reaction hypothalamus stimulates pituitary gland to release adrenocorticotrophic hormone (acth), which triggers the release of cortisol: cortisol, release of stored nutrients (to meet bodily demands) Sustained release of endorphins (to deal with pain)
