IB skill practice

Analyse neurons, synapses, and signalling

Paper 1, Paper 2 5 marks Difficulty 3

Explain synaptic transmission

A synapse diagram in a neurobiology tutorial shows neurotransmitter released from one neuron and binding receptors on the next cell. Explain how the signal crosses the gap. Use the diagram labels, physiology pathway, feedback loop, or data values before answering. Enter the answer and choose the interpretation that best matches the biological evidence.

Worked practice: biological evidence and answer

Use the labelled biological evidence first, then connect it to the final answer.