BIPN 105 Lecture Notes - Lecture 3: Nernst Equation, Cell Membrane, Resting Potential
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1 Apr 2019
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Resting membrane potential (vm, voltage: sodium-potassium pump creates and maintains a concentration gradient, atp used to pump sodium out and potassium in, creates small electric gradient. Rest of electric gradient created by role of k: pump moves k+ inside the cell, creating higher concentration of k+ in icf, so there"s a concentration gradient. This causes a diffusion force: cell membrane relatively permeable to k+, not na+. When there"s an equilibrium of push-pull, no movement (chemical force = electrical force), which occurs at resting membrane potential: need both driving force and pathway to diffuse out, nernst equation: predicts the equilibrium potential (eion) [ion] = concentration of ion: eion = voltage due to the ion, equilibrium potential allows us to predict membrane resting potential based on concentrations of a particular ion. Ek+ = -90. 1 mv: role of na+ in resting membrane potential, higher concentration of na+ on outside causes na+ to diffuse in.
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