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During a reflex such as pulling the hand off a hot pan, what is the correct order in which the nerve impulse travels?
AReceptor, sensory neuron, spinal cord, motor neuron, effector
BEffector, motor neuron, spinal cord, sensory neuron, receptor
CReceptor, motor neuron, brain, sensory neuron, effector
DSensory neuron, receptor, effector, spinal cord, motor neuron
Answer & Solution
Correct answer: A. Receptor, sensory neuron, spinal cord, motor neuron, effector
1. A reflex begins at the receptor, where the stimulus such as heat is detected.
2. The receptor fires a sensory neuron that carries the message inward.
3. The signal reaches the spinal cord, which relays it to a motor neuron.
4. The motor neuron then drives the effector (muscle) to act.
5. Option B reverses the whole order, starting at the effector, so it is a trap.
6. Option C wrongly routes through the brain and swaps the neuron roles.
7. Option D starts at a neuron and scrambles the receptor and effector positions.
8. The correct order is receptor, sensory neuron, spinal cord, motor neuron, effector, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 15 Nervous System "Reflex Action", p.231_
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