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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. 1 2
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 releases neurotransmitter
Answer
Transmission is unidirectional because only the presynaptic neurone, specifically the presynaptic knob, releases the neurotransmitter, such as acetylcholine. The presynaptic neurone is responsible for storing and releasing this chemical, which is crucial for synaptic transmission.
Step 2
2. Only the postsynaptic neurone has receptors
Answer
Moreover, the reception of the neurotransmitter occurs exclusively at the postsynaptic neurone, where the receptors are located. This receptor presence allows for the signal to be received only by the postsynaptic neurone, thus creating a one-way communication pathway.