(a(i))[3]
Name the structures shown by labels A, B and C on Fig. 1.1.
(a(ii))[2]
The rat motor neurone carries impulses at $50\,\text{m s}^{-1}$, while the snail motor neurone carries them at $8\,\text{m s}^{-1}$. Explain why the rat motor neurone has a faster impulse transmission speed than the snail motor neurone.
(b)[3]
Compare the action potentials illustrated in Fig. 1.2 and Fig. 1.3.