(a)[2]
Identify the structures labelled A and B.
(b)[4]
With reference to voltage-gated sodium ion channels, explain why an action potential travels at different speeds along a myelinated neurone and a non-myelinated neurone.
Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
Fig. 9.1 presents a cross-section of a myelinated neurone.