IB Biology HL C2.2.6 Neurotransmitter Release Questions

Follow the release sequence from presynaptic depolarization and calcium entry to vesicle fusion and neurotransmitter exocytosis into the synaptic cleft.

Exam points

Explain how an arriving action potential depolarizes the presynaptic terminal, opens voltage-gated Ca²⁺ channels and triggers Ca²⁺ influx, vesicle fusion and neurotransmitter exocytosis.

[Maximum number: 3]

The diagram shows part of two neurons.

Figure for Question IB Biology HL C2.2.6 Neurotransmitter Release Questions question 1 — IB Biology HL

X indicates the movement of a structure in the neuron. Explain what events trigger this movement and what happens next.

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IB Biology HL C2.2.6 Neurotransmitter Release Questions question 1