The Inactivation Gate

question 14

Multiple Choice

The inactivation gate

• A) quickly opens and closes after depolarization.
• B) is coupled to the movement of the activation gate, but is much slower.
• C) depends on a change of +100 mV from rest to be signaled to close.
• D) depends on a loss of Na⁺ permeability to be triggered.
• E) depends on a loss of K⁺ permeability to be triggered.

---

Definitions:

Marginal Cost

The expense incurred from manufacturing an extra unit of a product or service.

Average Total Cost

A rephrased definition: The per unit production cost calculated by dividing the sum of all production costs by the quantity of output produced.

Variable Cost

Costs that change in proportion to the level of output or activity of a business.

Fixed Costs

Expenses that do not change with the amount of goods or services produced, such as rent or salaries.