NROC61H3 Lecture Notes - Lecture 10: Adrenal Medulla, Chromaffin Cell, Sympathetic Nervous System
Document Summary
3:09 pm disrupt homeostasis to an unusual free. Stress: body"s response to any change/event that either disrupts, or threatens to. Acute: extreme heat/cold; blood volume depletion by heavy bleeding, dehydration, hypoglycaemia, pain, sleep deprivation, stress that causes a fear reation worries, difficulties at work, commuting, etc. Chronic: pain, infection, housing problems, marital problems, financial. Stress response system is the body"s natural, adaptive survival system. Ex: gazelle, scared, but then goes back to baseline. Before a job interview, exam etc increases vigilance and attention. Chronic: predation, but rather stressed with each other. Have potential to tip the stress response system out of control. Ex: wild african baboons with strong social structure. Low ranking male baboons and loner females have highest levels of cortisol. Fight or flight which involves adrenaline / noradrenaline. Hypothetical adrenaline and cortisol responses to acute/chronic stressors. It stays around in the system for a while. If your stress level is constant, it never goes back to baseline.
