Which of the Following Is True About the Movement of Ions

question 38

Multiple Choice

Which of the following is true about the movement of ions across excitable living membranes?

• A) Ions always move passively across membranes.
• B) Ions always move actively across membranes through leakage channels.
• C) Ions always move from an area of higher concentration to an area of lower concentration.
• D) Sodium gates in the membrane can open in response to electrical potential changes.

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Definitions:

Variable Cost

Costs that change in proportion to the level of output or activity, such as materials and labor used in production.

Fixed Cost

A constant expense that does not change with the level of production or sales.

Total Revenues

The complete amount of income generated by a company or organization before any expenses are deducted.

Average Total Cost

The total cost of production divided by the number of units produced, representing the average cost per unit.