Choose the Correct Statements About Resting Membrane Potential I. The resting membrane potential is typically around -70 mV.

Question

Choose the Correct Statements About Resting Membrane Potential:

I. The resting membrane potential is typically around -70 mV.

II. The sodium-potassium pump actively maintains this potential.

III. At rest, the membrane is more permeable to Na+ than K+.

IV. Resting potential is maintained by passive ion diffusion and active transport.

1. A. Only I and II
2. B. Only II, III, and IV
3. C. Only I, II, and IV (Correct answer)
4. D. All of the above

Correct Answer

Option C — Only I, II, and IV

Detailed Solution & Explanation

The correct answer is Only I, II, and IV.

Key Points

• I is TRUE (-70 mV is correct).
• II is TRUE (Na+/K+ ATPase maintains the gradient).
• III is FALSE - at rest, membrane is more permeable to K+ than Na+.
• IV is TRUE (both passive diffusion and active Na+/K+ pump maintain resting potential).