Nose · ReflexLight-induced sneezing
Bright light can trigger sneezing in some people.
Frequency: Varies by individualReflex
Nose · Reflex
Nerves · ReflexSleep start
A brief muscle jerk can occur while falling asleep, sometimes with a feeling of falling.
Frequency: Common
Nose · ReflexRunny nose while eating
Hot or spicy foods can make the nose run.
Frequency: Varies by individual
Mouth & Throat · ReflexReflux-related laryngeal cough
Rising stomach acid can trigger a cough or throat-clearing urge in the larynx. Symptoms often occur without classic heartburn.
Frequency: Frequency unclear
Internal Organs · ReflexGastrocolic reflex
A meal can trigger the urge to have a bowel movement shortly afterward.
Frequency: Common
Ears · ReflexGaze remains stable
When the head moves, the eyes move in the opposite direction so the image remains stable.
Frequency: Common
Nerves · ReflexThe protective corneal reflex
A stimulus on the cornea can trigger rapid closure of both eyelids.
Frequency: Common
Muscles · ReflexStretch reflex
A muscle contracts automatically after a rapid stretch.
Frequency: Common
Nerves · ReflexSneezing
Irritation of the nasal mucosa triggers a coordinated exhalation to remove particles.
Frequency: Common
Internal Organs · ReflexThe stomach makes room
The upper stomach relaxes during a meal and receives food.
Frequency: Common
Muscles · ReflexCrossed extensor reflex
A painful stimulus bends one side and extends the other.
Frequency: Common
Nerves · ReflexCough
Irritation in the airways activates a protective reflex with a forceful burst of air.
Frequency: Common
Eyes · ReflexPupillary light reflex
Bright light automatically constricts the pupil; darkness makes it enlarge again.
Frequency: Common
Muscles · ReflexPlantar reflex
Movement of the toes after stimulation of the sole of the foot.
Frequency: Common
Nerves · ReflexStartle response
A sudden stimulus can trigger a whole-body response within milliseconds.
Frequency: Common
Mouth & Throat · ReflexSalivary reflex
The sight, smell, or taste of food increases saliva production.
Frequency: Common
Eyes · ReflexReflex tearing
Smoke, onions, or dry air irritate the eye surface and trigger tears. This reflex protects and rinses the cornea.
Frequency: Common
Mouth & Throat · ReflexGag reflex
Touching the back of the throat can trigger gagging.
Frequency: Varies by individual
Internal Organs · ReflexRectoanal inhibitory reflex
When the rectum fills, the internal sphincter briefly relaxes as a reflex.
Frequency: Common
Ears · ReflexEar popping on swallowing
Swallowing can briefly open the Eustachian tube.
Frequency: Common
Mouth & Throat · ReflexBrain freeze
Cold against the palate can trigger a brief, stabbing pain in the forehead.
Frequency: Varies by individual
Mouth & Throat · ReflexThroat clearing
A short cough-like burst clears a sensation of mucus from the larynx.
Frequency: CommonSurprisingly quiet here.
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