Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 4 PCB MCQ (Single Correct)

When a membrane is at the resting potential, the concentration of

A
Sodium and potassium ions are higher on the inside of its membrane
B
Sodium and potassium ions are higher on the outside of its membrane
C
Sodium ions are higher on the inside of its membrane and potassium ions are higher on the outside
D
Sodium ions are higher on the outside of its membrane and potassium ions are higher on the inside

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The correct answer is:
D

When a neuron is not conducting any impulse, the axonal membrane is comparatively more permeable to potassium ion and impermeable to sodium ions . Similarly, the membrane is impermeable to negatively charged proteins present in the axoplasm. Axoplasm inside the axon is negatively charged due to high concentration of and fluid outside the axon is positively charged due to high concentration of and thus form a concentration gardient. These gradient is maintained by the active transport of ions by sodium potassium pump which transport outwards for into the cell.

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