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alarm reaction

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noun Physiology.
  1. the first stage of the general adaptation syndrome, in which the body responds to stress by exhibiting shock.
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Origin of alarm reaction

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

alarm reaction in Medicine

alarm reaction

(ə-lärm)
n.
  1. The initial stage in the body's response to stressful stimuli, characterized by adaptive physiological changes, such as increased hormonal activity and increased heart rate.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.