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At a synapse, the impulse passing from one neuron's axon terminal to the next neuron is carried across the gap by the release of which kind of substance?
AAntibodies
BNeurotransmitters
CDigestive enzymes
DRespiratory pigments
Answer & Solution
Correct answer: B. Neurotransmitters
1. The synapse is a gap between the synaptic knob and the next neuron.
2. The electrical impulse cannot jump the gap directly, so a chemical is released.
3. Antibodies fight infection and enzymes aid digestion, ruling out options A and C.
4. The chemicals released across the synapse are neurotransmitters, option B.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 15 Nervous System "Synapse", p.226_
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