5. A resting nerve cell has the following ion concentrations and Intracellular: 140 mM K+; 12 mm Nat; 5 mM CI: 0.0001 mM

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5 A Resting Nerve Cell Has The Following Ion Concentrations And Intracellular 140 Mm K 12 Mm Nat 5 Mm Ci 0 0001 Mm 1 (49.17 KiB) Viewed 49 times

5. A resting nerve cell has the following ion concentrations and Intracellular: 140 mM K+; 12 mm Nat; 5 mM CI: 0.0001 mM Ca2+ Extracellular: 5 mM K; 140 mM Nat; 120 mM CI; 2 mm Ca2+ Permeability values: Pk = 40, PNa = 1, Pa = 0.5, Pca = 0 Use these parameters to answer questions A-D In the box shown. Show work for full credit A. (1 PT) What is the equilibrium potential for Nat? B. (2 PTS) Explain why a drug that completely blocks K+ channels would cause Vm to depolarize. D. (1 PT) Explain why treatment of the cell with ouabain, which blocks Na/K-ATP- ase in the membrane but does not affect other ion permeabilities, causes Vm to depolarize (decrease).