14. Ions and Voltages
Published Online: 27 JAN 2004
Copyright © 2004 John Wiley & Sons, Inc.
Cell Biology: A Short Course, Second Edition
How to Cite
Bolsover, S. R., Hyams, J. S., Shephard, E. A., White, H. A. and Wiedemann, C. G. (2003) Ions and Voltages, in Cell Biology: A Short Course, Second Edition, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/047146158X.ch14
- Published Online: 27 JAN 2004
- Published Print: 14 NOV 2003
Print ISBN: 9780471263937
Online ISBN: 9780471461586
Because membranes are a barrier to the movement of ions, they can separate solutions with different ionic composition. This can set up transmembrane voltages which in turn exert a force on all the ions present. For every ion present it is possible to calculate an equilibrium voltage at which concentration and voltage forces balance. Channels are proteins that form water filled holes through membranes, while carriers change shape to allow solute across. Complex carriers can use the energy of a cellular energy currency to move solute up an electrochemical gradient.