Question

Which situation will result in the fastest Na⁺ movement to the right across a Na⁺ permeable membrane?

Answer 1

When the Na+ concentration is higher outside the cell than inside the cell, Na+ ions will rush into the cell, resulting in depolarization.

Step-by-step explanation:

The situation that will result in the fastest Na+ movement to the right across a Na+ permeable membrane is when the Na+ concentration is higher outside the cell than inside the cell. This concentration gradient will cause the Na+ ions to rush into the cell, driven largely by diffusion. Because sodium is a positively charged ion, it will change the relative voltage immediately inside the cell compared to outside, resulting in depolarization.