The diagram shows a cholinergic synapse.
A clinical neurotoxin, α\alphaα-bungarotoxin, is a highly selective inhibitor that binds irreversibly to nicotinic acetylcholine receptors (structure YYY) on the post-synaptic membrane, preventing acetylcholine from binding.
Which of the following statements, A to D, describes the direct consequence of α\alphaα-bungarotoxin on synaptic transmission?
It prevents the entry of calcium ions through structure WWW into the pre-synaptic knob.
It prevents the fusion of structure XXX with the pre-synaptic membrane.
It prevents the depolarisation of the post-synaptic membrane.
It causes continuous depolarisation of the post-synaptic membrane.
