Ion pump and membrane resting potential

Videonummer 11936728
Ion pump and membrane resting potential. Animation illustrating how the resting potential of a nerve cell membrane is maintained using ion pumps powered by ATP (adenosine triphosphate, lower left). The membrane (orange) is shown with an ion pump (red, left) and a potassium channel (green, right). The ion pump operates continuously, moving 3 sodium ions (red) from inside to outside the cell, and 2 potassium ions (blue) from outside to inside the cell. This results in a higher potassium ion concentration inside and a higher sodium ion concentration outside, but as the membrane in its resting state is more permeable to potassium ions than to sodium ions, the flow of potassium ions through the potassium channels (right) determines most of the resting membrane potential. This is around minus 70 millivolts (mV), close to the potassium ion equilibrium potential. For this animation with labels, see K004/2040.
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Biocosmos / Francis Leroy & Michael Pierard
Modell-Rechte: nicht erforderlich
Länge: 20 Sekunden
Seitenverhältnis: 16:9
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