An automatic reflex response triggered by chemical stimuli, such as gagging when you taste something bitter.
From chemo- (chemistry) + reflex (from Latin reflexus, 'bent back'). Reflex refers to automatic responses that bypass conscious thought. This term describes reflexes initiated by chemical detection.
When you accidentally bite into spoiled milk, your chemoreflex instantly makes you spit it out before your brain even processes 'this tastes bad'—your body's built-in chemistry alarm system.
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