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alarm reaction

noun, Physiology.
the first stage of the general adaptation syndrome, in which the body responds to stress by exhibiting shock.
Origin of alarm reaction
1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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alarm-reaction in Medicine

alarm reaction a·larm reaction (ə-lärm')
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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