This movement is against the concentration gradient so the transport proteins require an energy supply. Energy is provided by the breakdown of ATP inside the cell. This diagram shows molecules ...

Pure water has the highest water concentration. A concentration gradient exists when there is a region of high concentration leading to a region of low concentration: ...

Figure 1: Anatomy of the electric eel and structure of the natural electrocyte. Figure 2: Schematic diagram of a system of electrogenic cells used in the simulations, and subsequent action ...