How Can Synaptic Vesicles Continue to Pour Out Their Neurotransmitters

question 255

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 the gap between the axon and the dendrite
• B) Other nearby cells donate a portion of neurotransmitter to the vesicle 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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Definitions:

Fischer Projection

A two-dimensional representation of a three-dimensional organic molecule by projection, used to depict stereoisomers.

Fischer Projection

A two-dimensional representation of a molecule's structure to display chirality by projecting asymmetric carbon atoms.

(2S,3R)-2,3-Dihydroxybutanoic Acid

A specific stereochemical form of dihydroxybutanoic acid, an organic compound with two hydroxyl groups located at the second and third carbons.

Erythro

A descriptor in stereochemistry denoting molecules with similar substituents on the same side in a Fisher projection.