HLTC22H3 Chapter 10: Chapter 10 Textbook notes
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1) physiological state of the organism (sometimes referred to as a strain) 3) view stress as a transaction between the person and the environment. stress as a physiological state: classic theories. Canon was the first physiologist to systematically describe the physiological effects of stress. Canon posited that the perception of a threat activated the sympathetic nervous system (sns), which readies the organism for fight or flight. Once the threat is resolved, parasympathetic nervous system (pns) activation returns the body to homeostasis by decreasing heart rate and respiratory rates, as well as bp and returning blood flow to the internal organs. The hypothalamic-pituitary-adrenal (hpa) activation is a slower but more sustained response to a wide variety of stressors, chemical toxins, and psychosocial problems. Stress can affect the functioning of nearly every organ system in the body, either through. 1) alarm stage: fight/flight and involves the adrenal glands as well as sns activation.
