(a)[3]
On Fig. 8.1, use label lines and letters to identify each of the following: X - a structure showing that A is a pre-synaptic neurone Y - a region containing many voltage-gated Na⁺ channels Z - a region containing both acetylcholine and acetylcholinesterase.
(b)[3]
Some insecticides have a similar structure to acetylcholine. Suggest how these insecticides may influence the activity of acetylcholinesterase.
(c)[2]
Outline the functions of synapses in the nervous system.