Sudden, spontaneous response to a stimulus is called as
A
Reflex action
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B
Reflex stimulus
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C
Motor impulse
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D
Sensory impulse
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Solution
The correct option is B Reflex action Reflex action is an involuntary and nearly instantaneous movement in response to a stimulus. In other words, when a receptor is stimulated, it sends a signal to the central nervous system, where the brain coordinates the response, but sometimes a very quick response is needed, one that does not involve the brain. This is a reflex action.