NEET Previous Year Question
During the transmission of nerve impulse through a nerve fiber, the potential on the inner side of the plasma membrane has which type of electric charge?
Topic: NEET PYQ
Answer: D. Full step-by-step solution below.
- AFirst positive, then negative and continue to be negative
- BFirst negative, then positive and continue to be positive
- CFirst positive, then negative and again back to positive
- DFirst negative, then positive and again back to negative
Correct answer: D
Solution
(d) Resting state: Inside of the neuron is negative.Depolarization (nerve impulse): Na⁺ enters, inside becomes positive.
Repolarization: K⁺ exits, inside becomes negative again.
Sequence: Negative → Positive → Negative
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