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Spatial Summation

Spatial Summation
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Description: Removal of Neurotransmitter

Neurotransmitter can be removed from the synaptic cleft by:
Diffusion
Enzymatic degradation
Uptake into cells

Summation

If several presynaptic end bulbs release their neurotransmitter at about the same time, the combined effect may generate a nerve impulse due to summation
Summation may be spatial or temporal

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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40906
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