Give two reasons why transmission across a cholinergic synapse is unidirectional - AQA - A-Level Biology - Question 7 - 2022 - Paper 2
Question 7
Give two reasons why transmission across a cholinergic synapse is unidirectional.
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Worked Solution & Example Answer:Give two reasons why transmission across a cholinergic synapse is unidirectional - AQA - A-Level Biology - Question 7 - 2022 - Paper 2
Step 1
1. (Only) the presynaptic neurone/knob/membrane releases/has neurotransmitter/acetylcholine:
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Answer
Transmission is unidirectional because only the presynaptic neuron releases acetylcholine, which binds to receptors on the postsynaptic membrane.
Step 2
2. (Only) the postsynaptic neurone/membrane has receptors:
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Answer
The postsynaptic neurone has specific receptors for acetylcholine. Therefore, any neurotransmitter released can only influence the postsynaptic neurone.
