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Title: Transmission across a Synapse
Description: The steps with a diagram- useful for revision
Description: The steps with a diagram- useful for revision
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NadiaA
Transmission across Synapses
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An action potential arrives at the synaptic knob
Voltage gated calcium ion channels open
Calcium ions diffuse into synaptic knob
Calcium ions cause the synaptic vesicles to move toward the pre-synaptic membrane
and fuse with it
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Acetylcholine molecules diffuse across the synaptic cleft
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this is an example of a ligand gated channel
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Sodium ions diffuse across the post synaptic membrane into the post synaptic
neurone
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If the generator potential reaches the threshold potential for an action potential to
occur, a new action potential will be generated in the post synaptic neurone
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This will diffuse back into the presynaptic neurone using ATP to turn
back into ACh in a reaction so it can be reused again for another action potential
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Axon takes information away from
the cell body
Dendrites take information toward
the cell body
Image source
http://www
...
info/encyclo
pedia/N/neurotransmitter
Title: Transmission across a Synapse
Description: The steps with a diagram- useful for revision
Description: The steps with a diagram- useful for revision