reflex

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reflexive action

knee-jerk reflex

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Nelson Mandela, undated photo.

15 Nelson Mandela Quotes

Close up of praying mantis walking on stone ground against a blurred background in Japan

6 Animals That Eat Their Mates

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

There’s a Riot Goin’ On: Riots in U.S. History (Part One)

Artist interpretation of space asteroids impacting earth and moon. Meteoroids, meteor impact, end of the world, danger, destruction, dinosaur extinct, Judgement Day, Doomsday Predictions, comet

Major Mass Extinctions

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

reflex: Facts & Related Content

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Facts

Also Known As	response

Photos

reflexive action

knee-jerk reflex

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Topics

yawning innate reflex flexor reflex fixation reflex extensor reflex lacrimal reflex pupillary light reflex inhibition conditioned reflex recruiting reflex fight-or-flight response stereotyped response adjustment photoperiodism

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Key People

Marshall Hall, detail of an engraving by J. Holl, 1839, after a portrait by J.Z. Bell

Marshall Hall

British physiologist