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| Description: a. Changes in membrane conductance at a point on an axon as a neural impulse passes. The membrane first becomes permeable to sodium ions, allowing a large inward rush of Na+. A decrease in the Na+ permeability results and is in turn followed by an outward flow of K+ b. Changes in membrane potential accompanying the permeability changes shown in (a). As Na+ rushes in, the potential increases and becomes positive. As K+ influx increases, the potential decreases, undershooting the resting potential, before returning to the resting potential. Picture Stats: Views: 272 Filesize: 52.6kB Height: 587 Width: 361 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34353 |