NURS 3001 Lecture Notes - Lecture 7: Angina Pectoris, Glossophobia, Atypical Antipsychotic
14 Sep 2017
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Document Summary
The three stages of gas include: alarm: the initial, brief, and adaptive response (fight or flight) to the stressor. During the alarm stage, three principle stress mediators are involved: the brain"s cortex and hypothalamus signal the adrenal glands to release the catecholamine adrenaline. This release, in turn, increases sns activity, resulting in increased heart rate, respirations, and blood pressure to enhance speed and strength. Pupils dilate for a broad view of the environment, and blood is shunted away from the digestive tract (causing dry mouth) and kidneys to more essential organs: the hypothalamus also sends messages to the adrenal cortex. The adrenal cortex produces corticosteroids to help increase muscle endurance and stamina, whereas other nonessential functions (e. g. , digestion) are decreased. Unfortunately, the corticosteroids also inhibit functions such as reproduction, growth, and immunity: endorphins are released that reduce sensitivity to pain and injury.
