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The electrical potential difference across the resting plasma membrane called the resting potential is maintained by all except :


( A ) When a neuron is not conducting any impulse, i.e., resting, the axonal membrane is more permeable to potassium ions (K+)
( B ) The membrane is impermeable to negatively charged proteins present in the axoplasm.
( C ) When a neuron is not conducting any impulse, i.e., resting, the axonal membrane is nearly impermeable to sodium ions (Na+).
( D ) none of the above
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1 Answer

(D) is the right answer.

When a neuron is not conducting any impulse, i.e., resting, the axonal membrane is comparatively more permeable to potassium ions (K+) and nearly impermeable to sodium ions (Na+). Similarly, the membrane is impermeable to negatively charged proteins present in the axoplasm. Consequently, the axoplasm inside the axon contains high concentration of K+ and negatively charged proteins and low concentration of Na+. These ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump which transports 3 Na+ outwards for 2 K+ into the cell. The electrical potential difference across the resting plasma membrane is called as the resting potential.
answered Apr 3, 2014 by pady_1
 

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