A: Ion Channels and Resting Membrane Potential Table 1 below contains values for various intracellular concentrations, extracellular concentrations, and ion conductance information for a cardiac cell. Extracellular (mM) Table 1: lon Nat 284 K+ 4 CI Ca2+ 120 10 Intracellular (mM) Resting Conductance (mS/cm²) 15 0.001 300 0.1 20 0.01 0.0001 1 1. Calculate the Nernst potential (nearest mV) for each of the above four ions (Na*, K*, CI¯, Ca²+) assuming a temperature of 27 °C. Please show all work. (Possibly useful constants: R = 8.314 J K¹ mol‍¹; F = 9.65 x 104 C mol¹; J=Joule; K=Kelvin; C=Coulomb) 2. What is the resting potential (nearest mV) across the membrane using the Nernst potentials calculated in part 1 and the given conductance? (Note, please use the Nernst potentials rounded to nearest mV calculated in part 1 and show all work). Which ion's conductance dominates resting membrane potential and state the reasoning you used. (one or sentences)?

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What is tubectomy?