The Depolarization of the Presynaptic Membrane of an Axon Terminal

question 20

Multiple Choice

The depolarization of the presynaptic membrane of an axon terminal most directly causes

• A) voltage-gated calcium channels in the membrane to open.
• B) synaptic vesicles to fuse with the membrane.
• C) an action potential in the postsynaptic cell.
• D) the opening of chemically sensitive gates that allow neurotransmitter to spill into the synaptic cleft.
• E) neurotransmitter to bind to receptors on the postsynaptic membrane.

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Definitions:

Emulsion

A stable mixture of two or more immiscible liquids, such as oil and water, often with an emulsifier to maintain stability.

Colloid

A mixture wherein fine particles are dispersed throughout another substance without dissolving, such as in gels or emulsions.

Suspension

Liquid through which a solid is dispersed and from which the solid separates unless the liquid is kept in motion.

Equilibrium

A state of balance between opposing forces or actions.