OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which of the following is NOT a part of the reflex arc?

  1. The sensory neuron

  2. The conscious brain

  3. The motor neuron

  4. The relay neuron

The correct answer is: The conscious brain

The reflex arc is a neural pathway that mediates a reflex action, which is an automatic and rapid response to a stimulus. It typically involves the sensory neuron, which detects the stimulus; the relay neuron, which is located in the spinal cord and processes the information; and the motor