Which of the following best explains the observation that a resting neuron membrane, while highly permeable to potassium ions, is not at the equilibrium potential for potassium?
A) The membrane is also slightly permeable to sodium ions.
B) The membrane is also fully permeable to calcium ions.
C) The membrane is also impermeable to sodium ions.
D) The membrane is also highly permeable to chloride ions.

Question

Quizplus · Accepted Answer

The resting neuron membrane is not at the potassium equilibrium potential primarily because it is also slightly permeable to sodium ions. This slight permeability to sodium allows some sodium ions to enter the neuron, which affects the overall membrane potential, preventing it from reaching the equilibrium potential for potassium alone.

Which of the Following Best Explains the Observation That a Resting