When the potential across a membrane reaches threshold, the sodium channels ____.
A) open to let sodium enter the cell rapidly
B) close to prevent sodium from entering the cell
C) open to let sodium exit the cell rapidly
D) close to prevent sodium from exiting the cell

Question

Quizplus · Accepted Answer

When the potential across a membrane reaches threshold, the sodium channels open to let sodium enter the cell rapidly, resulting in depolarization of the membrane. This process triggers the action potential.

When the Potential Across a Membrane Reaches Threshold, the Sodium