Biophysics Textbook On Line “Channels, Receptors, and Transporters”

Introduction. The description of ionic movement through biological membranes is an old topic, nearly as old as the description of diffusion itself. For some 150 years, the movement of molecules through membranes has been known to depend on the nature of the membrane and the concentration of the molecules. For nearly as long, the movement of ions has been known to depend on the electrical potential across the membrane. Th