KINE 2011 Lecture Notes - Lecture 23: Electrochemical Gradient, Membrane Transport, Membrane Potential

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 2011
• Professor: Ali Abdul Sater

Document Summary

Any molecule crossing the membrane no matter what the size or charge or polarity it will require force. And if that force does not require us to use energy, then that is a passive force. And if it does require us to use force that is active force. Molecules that can penetrate the plasma membrane on their own passively driven across the membrane by two forces: Movement along an electrical gradient (related to the charge of the molecules) If you look at the picture you see molecules are going from high concertation to the lower concentration. But it could go also vice versa but not a lot of them. And again the net movement is highly favored from a to b. You need to remember that the plasma membrane is selectively permeable. So certain molecules are going to be able to pass freely. Some molecules require channels and some will die.