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IB Biology HL C2.2.7 Excitatory Postsynaptic Potential Questions

Practise IB Biology HL 2.2.7 by analysing how transmitter binding and receptor action initiate postsynaptic responses.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how neurotransmitter binding changes postsynaptic ion flow, depolarizes the membrane and can initiate an action potential.

IB Biology HL C2.2.7 Excitatory Postsynaptic Potential Questions question 1

[Maximum number: 2]

Cholinergic synapses use acetylcholine as their neurotransmitter. They are widespread in the body, passing on signals to muscle cells. These synapses are affected by neonicotinoid pesticides.

The diagrams, which are not drawn to scale, show the synapse between two neurons and a detail of the synaptic cleft.

Figure for Question IB Biology HL C2.2.7 Excitatory Postsynaptic Potential Questions question 1 — IB Biology HL

Explain how acetylcholine initiates an action potential in a postsynaptic membrane.

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