In Myelinated Axons

question 58

Multiple Choice

In myelinated axons

• A) potassium ions can diffuse into the axon only at sections that are myelinated.
• B) sodium ions can diffuse into the axon only at gaps in the myelin.
• C) sodium ions can diffuse out of the axon only at sections that are myelinated.
• D) All of the answer choices are correct.

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Definitions:

Cash Break-Even

The amount of revenue necessary to cover all cash operating expenses, ignoring non-cash costs.

Fixed Costs

Expenses that do not change with changes in the volume of production or sales, such as rent, salaries, and insurance.

Operating Leverage

A measure of how revenue growth translates into growth in operating income, indicating the percentage of fixed costs in a company's cost structure.

Financial Break-Even

The point at which total revenues and total expenses are equal, leading to a net income of zero.