IB Biology C2.2.6 Neurotransmitter release
IB Biology C2.2.6 Neurotransmitter release

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise describing neurotransmitter release from presynaptic neurons after an arriving impulse triggers calcium movement.
How this is tested
- explain how an action potential opens calcium channels in the presynaptic membrane
- describe vesicle movement, membrane fusion and neurotransmitter release by exocytosis
- use synapse diagrams to label the presynaptic membrane and vesicle contents accurately
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