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# Equations for Cell Physiology.docx

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School
Department
Physiology
Course
Physiology 3140A
Professor
Donglin Bai
Semester
Fall

Description
Equations for Cell Physiology Ohm’s Law I = Current V = Voltage R = Resistance G = Conductance Nernst Equation E K Equilibrium Potential of ion X R = Universal Gas Constant (2 calories/° K x mole) T = Absolute Temperature (° K: 273 + °C) + z = Valence of Ion (K = +1) F = Faraday’s Constant (# of charges per mole: 96,487 C/mole 4 2.3 x 10 calories/V x mole) [X]0= extracellular concentration of ion X [X]I= intracellular concentration of ion Ohm’s Law – Graphs E = membrane potential m E x equilibrium potential for ion X G x conductance When (E -Em) x 0 – current is outward (+) When (E -Em) x 0 – current is inward (-) When (E -Em) x 0 – current is 0 Slope = G Ix= (x-value – E x G x Goldman-Hodgkin-Katz Equation (Goldman Equation) E m membrane potential R = gas constant T = absolute temperature (K) F = Faraday’s
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