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A reflex refers to an involuntary and automatic response to a specific stimulus, mediated by the nervous system. It typically involves a sensory neuron that detects the stimulus, which then transmits signals to the spinal cord, leading to a rapid response through motor neurons without conscious thought. This mechanism allows for quick reactions to potentially harmful situations, playing a crucial role in protecting the body and maintaining homeostasis. Reflexes can be simple, such as the knee-jerk reaction, or more complex, involving multiple neural pathways.

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