For cardiac muscle cells, the intracellular concentration of potassium ions (K+) is 148 mM, while extracellular concentr

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For Cardiac Muscle Cells The Intracellular Concentration Of Potassium Ions K Is 148 Mm While Extracellular Concentr 1 (20.68 KiB) Viewed 36 times

For cardiac muscle cells, the intracellular concentration of potassium ions (K+) is 148 mM, while extracellular concentration of K+ is 4 mM. a) Use the Nernst equation to calculate the equilibrium potential of K' of a cardiac muscle cell. Keep 2 decimal places in your answer. (3 points) b) If the plasma membrane of a cardiac muscle cell becomes more permeable to K+, would there be K+ influx or K+ efflux at a resting membrane potential of -90 mV? Why? (3 points) c) Some scorpions produce a toxin that blocks voltage-gated K+ channels in cardiac muscle cells. Would this toxin increase, decrease, or have no effect on: • repolarization period? (1 point) • refractory period? (1 point) • frequency of action potentials? (1 point)