Potassium and sodium ions are known to have essential roles in the resting potential of a neuron. In mammals, the intracellular concentration for potassium and sodium ions are 140mM and 15mM, respectively; their external concentrations are 5mM for potassium and 150mM for sodium ions.
The plasma membrane of a neuron is more permeable to potassium ions than to sodium ions because the membrane has:
A. more ligand-gated potassium ion channels.
B. more voltage-gated sodium ion channels.
C. more carrier molecules for potassium ions.
D. more potassium leakage channels.
E. fewer voltage-gated sodium ion channels.
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