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Unformatted text preview: REV: Distribution of important ions
REV: REV: Ionic basis of Vrest
REV: Is a voltage characteristic of a living membrane? REV:Ionic basis of Vrest (cont’d)
(cont -70mV Na+ - K+ ATPase (pump) Fig. 3-17, p. 72 Ionic basis of Vrest - Summary
• The ions are distributed differently inside and
outside the cell.
• The cell is more negative inside relative to outside.
• Sodium and potassium are constantly trickling in and
out, respectively, according to their electrochemical
gradients and the permeability of the membrane to the
• The ionic concentrations are maintained by the
sodium/potassium ATPase, although this pump does
not, itself, contribute significantly to the resting
membrane potential. Changes in Membrane Potential
Changes Fig. 4‐1, p. 88 Neuronal Communication – Action Potentials
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This note was uploaded on 11/24/2011 for the course NPB 97952 taught by Professor ? during the Spring '09 term at UC Davis.
- Spring '09