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When a hand touches a very hot pan, the impulse travels along a defined pathway that produces the rapid withdrawal. This pathway taken by the nerve impulse is called what?
AReflex arc
BSynaptic knob
CCorpus callosum
DFilum terminale
Answer & Solution
Correct answer: A. Reflex arc
1. The question asks for the route the impulse follows during a reflex.
2. A synaptic knob is just the axon ending, not a whole pathway, ruling out option B.
3. Corpus callosum links the cerebral hemispheres and filum terminale is a spinal cord tip, ruling out options C and D.
4. The pathway of a reflex impulse is the reflex arc, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 15 Nervous System "Reflex Action", p.231_
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