Cell membrane under resting conditions is impermeable to all the ions except_____________?
Correct answer: B. K+
- A. Na+
- B. K+
- C. Cl-
- D. PO4-2
Explanation
At rest, the neuronal membrane has many potassium leak channels and is therefore much more permeable to K+ than to Na+ or large intracellular anions. K+ tends to diffuse outward, helping establish the negative resting potential inside the cell. The likely alternative is Na+, because sodium is important during the action potential, but resting permeability to Na+ is relatively low.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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