alarm re action

alarm reaction

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

Origin:
1935–40

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American Heritage
Medical Dictionary

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