How Can Synaptic Vesicles Continue to Pour Out Their Neurotransmitters

question 7

Multiple Choice

How can synaptic vesicles continue to pour out their neurotransmitters, and yet still have a ready supply of neurotransmitters to respond to continuing stimulation?

• A) Through the process of reuptake, they absorb some of the neurotransmitter left in the gap between the axon and the dendrite.
• B) Other nearby cells donate a portion of neurotransmitter to the vesicle in need, through a process called "synaptic transfer."
• C) The vesicles never fire completely, always holding a little amount of neurotransmitter back.
• D) The cells re-energize with every firing.

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