Q. Assertion : Transmission of the nerve impulse across a synapse is accomplished by neuro‐transmitters.
Reason : Transmission across a synapse usually requires neurotransmitters because there is small space. i.e., synaptic cleft, that separates one neuron from another.

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Solution:

Transmission of the nerve impulse across synapse is accomplished by neurotransmitter. Transmission across a synapse usually requires neuro-transmmitters because there is small space i.e. synaptic cleft separates one neuron from another. Most synaptic transmission is carried by a chemical called neurotransmitter. These are low molecular mass substances released in minute amounts at interneural, neuromascular and neuroglandular substances. Most wide spread transmitter is acetylcholine.