Textbook Notes (368,432)
Canada (161,877)
HLTC22H3 (102)
Dan Silver (21)
Chapter 10

chapter 10

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Health Studies
Dan Silver

Ch 10 Stress Coping and HealthThrough the neuroendocrine system psychosocial stress can have adverse effects on the cardiovascular and immune systemsOlder adults become vulnerable to the effects of stressWhether stress has positive or negative effects may depend on its temporal patterning and also on how we cope with itSTRESSClassic Theories3 ways of defining stress1 a physiological state of the organism2 a characteristic of the environment or stressor3 To view stress as a transaction btwn the person and the environmentCannon noted that cats exposed to barking dogs would respond with a rush of epinephrine or adrenaline into their systemsHe noted that the perception of a threat activated the sympathetic nervous system SNS which readies the organism to fight or flightThe SNS reacts to stress in 2 ways o1 the sympathetic nerves originate in the spinal column and radiate to the target organs The preganglionic nerves are cholinergic that is they secrete the neurotransmitter acetylcholine The postganglionic nerves use norepinephrinendo2the 2 type of SNS response is a little less direct In the sympatheticadrenal medulla SAM system the sympathetic nerves radiate to the adrenal medulla which is a small structure lying atop of the kidneys The adrenal medulla or center secretes both epinephrine adrenaline and norepinephrine noradrenaline into the bloodOnce the threat is resolved parasympathetic nervous system PNS activation returns the body to homeostasis by decreasing heart rate and respiratory
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