A Series of Steps Occurs Between the Arrival of an Action

question 96

Multiple Choice

A series of steps occurs between the arrival of an action potential at a presynaptic axon terminal and the initiation of an action potential in the postsynaptic neuron.What is the last step in this process?

• A) Opening of Ca²⁺ channels in the presynaptic membrane
• B) Fusing of synaptic vesicles with the presynaptic membrane
• C) Spreading of depolarization to neighboring regions of the postsynaptic membrane
• D) Influx of Na⁺,causing a graded depolarization of the postsynaptic membrane
• E) Binding of acetylcholine to gated receptor proteins,allowing diffusion of Na⁺ and K⁺

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Definitions:

Depreciation

The allocation of the cost of a tangible asset over its useful life, reflecting wear and tear or obsolescence.

Fixed Costs

Costs that do not change with the level of production or sales activities within a certain range or period of time, such as rent, salaries, and insurance.

Contribution Margin

The amount remaining from sales revenue after variable expenses are deducted, indicating how much contributes to covering fixed costs and generating profit.

Variable Cost

Expenses that change in proportion to the volume of output or sales, including items like labor and materials.