Nerve Junctions

...a synapse is a junction between two or more neurones, where one neurone signals to another

Transmission across the Synapse:

1) Action Potential arrives at the synaptic knob

2) The voltage-gated calcium ion channels open

3) Calcium ions diffuse into the synaptic knob

4) Calcium ions cause synaptic vessels to move and fuse with the presynaptic membrane

5) Acetylcholine is released by exocytosis

6) Acetylcholine molecuels diffuse across the cleft

7) Acetylcholine binds to receptor sites on the Na ion channels in the…