Why Do Na⁺ Ions Enter the Cell When Voltage-Gated Na⁺

question 51

Multiple Choice

Why do Na⁺ ions enter the cell when voltage-gated Na⁺ channels are opened in neurons?

• A)because the Na⁺ concentration is much lower outside the cell than it is inside
• B)because the Na⁺ ions are actively transported by the sodium-potassium pump into the cell
• C)because the Na⁺ concentration is much higher outside the cell than it is inside, and the Na⁺ ions are attracted to the negatively charged interior
• D)because the Na⁺ concentration is much higher outside the cell than it is inside, and the Na⁺ ions are actively transported by the sodium-potassium pump into the cell
• E)because the Na⁺ ions are then able to pass through the plasma membrane unassisted

---

Definitions:

Sale

The exchange of a commodity or service for payment, constituting a basic economic transaction.

Open Market

A market with no barriers to the free exchange of goods and services.

Ownership Interest

Represents the percentage of an entity owned by a specific investor or shareholders.

Equity Method

An accounting technique used to record investments in which an investor has significant influence but does not have majority control, representing the investment's value based on the investor's share of the investee's equity.