pump
pump
pump
Sodium potassium ATPase pump.
Active transport uses energy to move substances against the concentration gradient.
Concentration Gradient
it is called a concentration gradient.
diffusion
The transport of a substance across the cell membrane against its concentration gradient is called active transport.
If a substance moves down its concentration gradient, it means that it is moving from an area where it has a high concentration to an area where it has a low concentration. This is known as diffusion.
there is a concentration gradient!:)
concentration gradient
concentration gradient