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Voluntary and involuntary movements - class-IX
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During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?
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A
First negative, then positive and again back to be negative
💡 Explanation:
At resting potential (polarized phase), the inside of the plasma membrane is negatively charged ($-70$ mV). As the stimulus reaches, it becomes positively charges ($+45$ mV, depolarized phase). As impulse passes away, it regains its original ionic distribution and again becomes negatively charged.