NURS 3220 Lecture Notes - Lecture 11: Stress (Biology), Sympathetic Nervous System, Adrenal Gland
Document Summary
Stress: perceived or anticipated threat that disrupts a person"s well-being or homeostasis, causes, psychological / emotional (fear, social rejection, physical (dramatic temperature changes, abuse, physiologic (infection, inflammation, stimulate, trigger the stress response. General adaptation syndrome: dr. selye termed this general stress response the general adaptation syndrome (gas, he perceived it as primarily physiologic. Gas stages: alarm stage, stressor triggers the hypothalamic-pituitary-adrenal (hpa) axis, activates sympathetic nervous system, arousal of body defenses (in other words ?) inflammaiton. The resistance/adaptation response: resistance/adaptation stage, begins with the actions of adrenal hormones, mobilization contributes to fight or flight. Exhaustion stage: exhaustion stage (allostatic overload, occurs only if stress continues and adaptation is not successful, leads to stress-related disorders, low stress when sleeping, bell shape curve, alertness at the top is optimal, some stress for peak performance. Allostatic exhaustion: parasympathetic starts higher, never goes back, sympathetic is over stimulated and parasymathetic under stimulated physiological distress, one goes up the other goes down.
