The diagram shows the structure of a cholinergic synapse.
Which of the following statements, A to D, correctly describes the function or regulation of the components shown?
The influx of Ca2+\text{Ca}^{2+}Ca2+ ions through channel X is an active transport process requiring the direct hydrolysis of ATP.
Inhibition of enzyme Z leads to the accumulation of acetylcholine in the cleft, causing persistent depolarisation of the postsynaptic membrane.
Neurotransmitter molecules released from structure Y are actively transported across the synaptic cleft to reach structure W.
Structure W is a voltage-gated sodium channel that opens immediately when the postsynaptic membrane is at its resting potential of −70 mV-70\text{ mV}−70 mV.
