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10 Cards in this Set
- Front
- Back
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What are the two types of Summation? |
Spatial Summation, Temporal Summation |
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What is the purpose of Summation? |
To allow low-frequency Action Potentials to be able to trigger new Action Potentials in Post-Synaptic Neurones. Multiple stimuli contribute to the same Action Potential. |
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What happens in Spatial Summation? |
Multiple Pre-Synaptic Neurones release enough Neurotransmitter to exceed the Threshold value and trigger an Action Potential in the Post-Synaptic Neurone. |
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What happens in Temporal Summation? |
A single Pre-Synaptic Neurone releases Neurotransmiiter multiple times over a short period of time. This eventually exceeds the threshold value and triggers an Action Potential in the Post-Synaptic Neurone. |
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What effect do Excitatory Synapses have on the membrane? |
Depolarisation, open Na+ Ion Channels |
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What effect do Inhibitory Synapses have on the membrane? |
Hyperpolarisation, releases GABA, open Cl- Ion Channels |
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What is the role of Inhibitory Synapses? |
Prevent the passage of an impulse from one Neurone to another. |
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Why are Inhibitory Synapses important? |
Allows specific pathways to be enabled without random stimulation all over the body. |
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Inhibitory Synapses can develop while learning certain skills. Why is this useful? |
These Synapses will refine the appropriate pathways involved in certain skills, such as writing or drawing, and improve their coordination and precision. |
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Can Excitatory and Inhibitory Synapses be involved in the same Summation? |
Yes |
