Biology Practice Problems Neurons and Action Potentials Practice Problems Solution: The plasma membrane of a neuron is more permeable ...

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Solution: 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.

Problem

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.

Solution

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.

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