(a(i))[3]
Name the structures marked A, B and C in Fig. 1.1.
(a(ii))[2]
The rat motor neurone conducts impulses at $50\,\text{m s}^{-1}$. The snail motor neurone conducts impulses 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]
Fig. 1.2 displays an action potential in a rat neurone and Fig. 1.3 displays an action potential in a snail neurone. Contrast the two action potentials shown in Fig. 1.2 and Fig. 1.3.