Synaptic Transmission 2
Acetylcholine transmits the nerve impulse across a cholinergic synapse.
This is how a nerve impulse is transmitted across a cholinergic synapse:
1. An action potential arrives at the synaptic knob of the presynaptic neurone.
2. The action potential stimulates voltage-gated calcium ion channels in the presynaptic neurone to open.
3. Calcium ions diffuse into the synaptic knob. (They’re pumped out afterwards by active transport).
4. The influx of calcium ions into…