A 44-year-old woman has a serum potassium of 5.5 mEq/L (normal: 3.5 to 5.0 mEq/L) and a serum sodium of 140 mEq/L (normal: 135 to 147 mEq/L). Which set of changes best describes the K⁺ Nernst potential and resting membrane potential in a typical neuron in this woman compared with normal? (Assume normal intracellular concentrations of Na⁺ and K⁺.) $\begin{array}{lll} & \underline{\text { K+ Nernst Potential }} & \underline{\text { Resting Membrane Potential }} \\\text { A. } & \text { Lessnegative } & \text { Less negative } \\\text { B. } & \text { Lessnegative } & \text { No change } \\\text { C. } & \text { Less negative } & \text { More negative } \\\text { D. } & \text { More negative } & \text { Less negative } \\\text { E. } & \text { More negative } & \text { More negative } \\\text { F. } & \text { More negative } & \text { No change } \\\text { G. } & \text { No change } & \text { Less negative } \\\text { H. } & \text { No change } & \text { More negative } \\\text { I. } & \text { No change } & \text { No change }\end{array}$

Question

A 44-year-old woman has a serum potassium of 5.5 mEq/L (normal: 3.5 to 5.0 mEq/L) and a serum sodium of 140 mEq/L (normal: 135 to 147 mEq/L). Which set of changes best describes the K⁺ Nernst potential and resting membrane potential in a typical neuron in this woman compared with normal? (Assume normal intracellular concentrations of Na⁺ and K⁺.)

\begin{array}{lll} & \underline{\text { K+ Nernst Potential }} & \underline{\text { Resting Membrane Potential }} \\\text { A. } & \text { Lessnegative } & \text { Less negative } \\\text { B. } & \text { Lessnegative } & \text { No change } \\\text { C. } & \text { Less negative } & \text { More negative } \\\text { D. } & \text { More negative } & \text { Less negative } \\\text { E. } & \text { More negative } & \text { More negative } \\\text { F. } & \text { More negative } & \text { No change } \\\text { G. } & \text { No change } & \text { Less negative } \\\text { H. } & \text { No change } & \text { More negative } \\\text { I. } & \text { No change } & \text { No change }\end{array}

Quizplus · Accepted Answer

The Answer of A 44-year-old woman has a serum potassium of 5.5 mEq/L (normal: 3.5 to 5.0 mEq/L) and a serum sodium of 140 mEq/L (normal: 135 to 147 mEq/L). Which set of changes best describes the K⁺ Nernst potential and resting membrane potential in a typical neuron in this woman compared with normal? (Assume normal intracellular concentrations of Na⁺ and K⁺.) $\begin{array}{lll} & \underline{\text { K+ Nernst Potential }} & \underline{\text { Resting Membrane Potential }} \ \text { A. } & \text { Lessnegative } & \text { Less negative } \ \text { B. } & \text { Lessnegative } & \text { No change } \ \text { C. } & \text { Less negative } & \text { More negative } \ \text { D. } & \text { More negative } & \text { Less negative } \ \text { E. } & \text { More negative } & \text { More negative } \ \text { F. } & \text { More negative } & \text { No change } \ \text { G. } & \text { No change } & \text { Less negative } \ \text { H. } & \text { No change } & \text { More negative } \ \text { I. } & \text { No change } & \text { No change } \end{array}$

A 44-Year-Old Woman Has a Serum Potassium of 5