Q81 / 200 · MHT CET - Medical 2026 (23 April Shift 1) · Biology
In a polarized state, the resting potential (average) of axon is -------------millivolts.
- A$-30$
- Correct answerB$-70$
- C$+30$
- D$+60$
Solution
In a resting or polarized state, the neural membrane is relatively more permeable to potassium ions ($K^+$) and nearly impermeable to sodium ions ($Na^+$).
Due to the unequal distribution of ions across the membrane, the inside of the axon becomes negatively charged with respect to the outside.
The electrical potential difference across the resting plasma membrane is called the resting potential, which is approximately $-70$ mV.
Answer: $-70$
Due to the unequal distribution of ions across the membrane, the inside of the axon becomes negatively charged with respect to the outside.
The electrical potential difference across the resting plasma membrane is called the resting potential, which is approximately $-70$ mV.
Answer: $-70$
Hence, the correct answer is option: 'B'.