The video tutorial explains the withdrawal reflex, a phasic reflex that occurs in response to a noxious stimulus. It contrasts this with a tonic reflex, which indicates potential neurological damage. Using a scene from 'Raiders of the Lost Ark', the video illustrates an abnormal physiological response to a hot object. The tutorial then details the mechanism of the withdrawal reflex, involving sensory neurons, interneurons, and motor neurons, leading to muscle contractions that remove the body part from the stimulus. Practical examples, such as stepping on a tack, are used to demonstrate the reflex in action.

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