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The term for an involuntary reaction to an external stimulus is a reflex.
reflex
knee jerk aka patellar reflex is an example of a stretch reflex
"reflex"
Electrical shock, shock, reflex, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction, trauma, injury, and corporal punishment.
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A reflex is a response to a given stimulus.an automatic instinctive unlearned reaction to a stimulus
reflex arc
knee jerk
An honest reaction is one that is considered a reflex. If someone hits someone and they respond back with a quick slap, that's an honest reflex, one that is not done purposefully.
A reflex is an involuntary response to an external stimulus, usually to protect the body. A reflex is much faster than a reaction. A reaction is a voluntary response to an external stimulus, and can be trained to become faster through regular practice. An example of a reflex is when the tendon below the kneecap is gently tapped. This causes the leg to kick slightly forward. This reflex is involuntary. An example of a reaction is a hockey goalie catching a hockey puck. This reaction is voluntary.
A reflex (lat. reflexus, "reflectance") is an automatic, unswayable reaction from an organism because of a stimulus or a specific situation.