Which of the following is the correct pathway of nerve impulse?
Correct answer: A. Receptors to CNS to Effectors
- A. Receptors to CNS to Effectors
- B. Effectors to Receptors to CNS
- C. CNS to Effectors to Receptors
- D. Effectors to CNS to Receptors
Explanation
A receptor detects the stimulus, a sensory neurone carries the impulse into the central nervous system, and a motor neurone carries the instruction out to the effector that responds. The direction is fixed by the one way nature of the synapse, since transmitter is released on one side only and receptors sit on the other. Any pathway beginning at the effector reverses the whole logic of the reflex.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Reflexes and the Reflex Arc
A reflex arc shows how a rapid, automatic response travels from a receptor through a sensory neuron, relay neuron and motor neuron to an effector. The topic covers synapses, the spinal cord's role, and the difference between an involuntary reflex action and a slower voluntary response.
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