Each stimulus releases the same amount of neurotransmitter. In some synapses, the amount of neurotransmitter may be insufficient to reach the threshold for an action potential in the postsynaptic neuron.
يؤدي كل تحفيز إلى إطلاق نفس كمية الناقل العصبي. في بعض المشابك، قد لا تكون كمية الناقل العصبي كافية للوصول إلى عتبة جهد الفعل في العصبون التالي.
| Front | stimuli causing release of how much NT, and if not enough |
|---|---|
| Back | each stimuli causes release of same number of NT into synapse, in some synapses, not enough NT to reach threshold so AP not triggered |
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