Tue September 29, 2009 By: Palak Jain


Expert Reply
Wed September 30, 2009

In chemical synapses the swollen tip of the axon of the presynaptic neuron is called the synaptic knob. It contains vesicles of neurotransmitter substance. Synaptic vesicles are membrane sacs that store neurotransmitter molecules ready for release near the presynaptic membrane.

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