The hormone ACTH that the pituitary gland releases to signal the adrenal cortex to produce cortisol and other stress hormones.
From 'adrenocorticotrophic' + '-in' (chemical suffix for hormones and proteins), alternative spelling of adrenocorticotropin.
ACTH is the messenger between your brain and your adrenal glands—when you're stressed, your pituitary floods your bloodstream with ACTH to wake up your stress response system.
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