The Synapse
- Created by: Sophia Dowden
- Created on: 11-06-16 10:53
View mindmap
- Synapse
- Functions
- Transmits impulses between neurons and from neuron to muscle.
- Filter out low level stimuli/ background stimuli
- Protects from over stimulation
- 1) When an action potential arrives at the axon terminal/endings, calcium moves into the synaptic knob
- 2) Synaptic vesicles fuse with the presynaptic membrane
- 3) Neuro-transmitter / acetylcholine (ACH) released exocytosis
- Another example of a neuro-transmitter - NOR-ADRENALINE
- 4) Diffuse over the synaptic cleft
- 5) ACH binds to receptors on the post synaptic membrane causing the Na+ channels to open.
- Na+ flows/floods in through the channels, this depolarises the post-synaptic membrane
- 6) ACH broken down by an enzyme called CHOLIN-ESTERASE
- The products diffuse back into the axon terminal through the pre-synaptic membrane where it is re-synthesised and packaged, ready for use
- 7) ATP is required for this process -re-synthesis and storage in the vesicles
- Functions
Comments
No comments have yet been made