A voltage-gated sodium channel opens, allowing sodium ions to move into a cell. Which of the following best describes the mechanism of transport involved in this process?
A)Facilitative diffusion
B)Simple diffusion
C)Primary active transport
D)Secondary active transport

Question

Quizplus · Accepted Answer

Simple diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration without the need for energy. When voltage-gated sodium channels open, sodium ions move into the cell down their concentration gradient, which is an example of simple diffusion.

A Voltage-Gated Sodium Channel Opens, Allowing Sodium Ions to Move