May/June 2026 Paper 42

2026 · 10 questions · 33 parts · 100 marks

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1(a)Neurones Synapses Neural SignallingMedium4 marks
Figure 1.1 is a diagram of a mammalian motor neurone.
Figure 1.1, a diagram of a mammalian motor neurone drawn left to right: a cluster of branching axon terminals at the far left labelled A; three shaded myelin-sheath segments along the axon labelled B, C and D in order, with small gaps between segments as the nodes of Ranvier; the cell body (soma) with its nucleus, bracketed together with the axon hillock and labelled E; a small branching dendrite at the top of the cell body, nearest the axon side, labelled F; and two further unlabelled branching dendrites extending from the upper-right and lower-right of the cell body.
Use the letters A–F in Figure 1.1 to identify each of the following.
A structure that forms a synapse with an intermediate neurone
A structure that forms part of a neuromuscular junction
A structure that provides insulation
Two structures that allow saltatory conduction
1(b)Neurones Synapses Neural SignallingHard4 marks
Outline the events that occur during an action potential.

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