Role of Synapses in Nervous System
- Created by: heatherbaker
- Created on: 04-03-16 15:38
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- Role of synapses in the Nervous System
- Convergence
- Several presynaptic neurones.
- To one postsynaptic neurone.
- Allow signals from all over NS to create same response.
- Divergence
- One presynaptic neurone.
- To several postsynaptic neurones.
- Allows one signal to be transported all over NS.
- Direction
- Only transmitted in one correct direction.
- Only presynaptic knob contains acetylcholine.
- Filtering low level signals
- Persistent low level- unlikely to pass across synapse.
- Several vesicles of acetylcholine needed to create action potential in postsynaptic neurone.
- Summation
- Spatial summation
- Several presynaptic neurones contribute to creating action potential.
- Temporal summation
- Series of action potentials in presynaptic neurone release many vesicles of acetylcholine
- Amplification of low level stimuli.
- Spatial summation
- Acclimatisation
- Repeated Stimulus
- Runs out of acetylcholine (or any transmitter)
- Synapse 'fatigued'
- Helps avoid over-stimulation of effector
- Repeated Stimulus
- Convergence
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