Short answerModerate1 mark
Name the neurotransmitter that allows the transmission of impulses across the synapse.
Topic: Acetylcholine
Previous-year question practice database
Answer
Exam answer
ACETYLCHOLINE.
Explanation
Acetylcholine is released from the tips of the axon into the synaptic cleft, diffuses across, and stimulates the next neuron to generate a fresh impulse. It is then broken down at once by an enzyme, so that the next impulse starts from a clean slate.
THAT RAPID BREAKDOWN is worth mentioning if you have room. Without it the neurotransmitter would keep stimulating the neuron and the signal could not be switched off — which is exactly how certain nerve poisons and insecticides work.
Spelling: ACETYLCHOLINE, one word.
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