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Dopamine is a neurotransmitter released in some synapses in the brain - AQA - A-Level Biology - Question 7 - 2018 - Paper 2

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Dopamine is a neurotransmitter released in some synapses in the brain. The transmission of dopamine is similar to that of acetylcholine. Dopamine stimulates the pro... show full transcript

Worked Solution & Example Answer:Dopamine is a neurotransmitter released in some synapses in the brain - AQA - A-Level Biology - Question 7 - 2018 - Paper 2

Step 1

Dopamine diffuses across the synapse

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Answer

Dopamine diffuses from the presynaptic neurone across the synaptic cleft and binds to receptors on the postsynaptic membrane.

Step 2

Binding to receptors

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Answer

Upon binding, dopamine activates specific receptors on the postsynaptic neurone, leading to the opening of ion channels.

Step 3

Entry of sodium ions and action potential

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Answer

As a result, sodium ions enter the postsynaptic neurone, causing depolarization and potentially generating an action potential if the threshold is reached.

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