Illustration of a model for the potassium and sodium ion channels through pores in the plasma membrane of an animal nerve cell: an example of active transport,where solutes (ions,sugars,amino acids) are pumped into cells from a region of lower to higher concentration. This is a reverse of free diffusion,where molecules move from higher to lower concentrations,that is,down the concentration gradient. The sodium/potassium exchange pump is described here: sodium ions (Na+,red spheres) are being actively pumped out of the cell in a compulsory exchange for potassium ions (K+,blue spheres) entering the cell | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Leroy, Francis / Biocosmos |
Bildgröße: | 2515 px × 3780 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |