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What is the primary factor responsible for axolemma depolarization during nerve conduction:
Simultaneous movement of equal amounts of Na+ and K+ across the axolemma
Inward movement of Na+ ions
Higher concentration of Na+ ions outside the axolemma
No specific factor contributes to axolemma depolarization
Answers (1)
The primary factor for axolemma depolarization during nerve conduction is the inward movement of Na+ ions. When a nerve impulse is transmitted, Na+ ions move into the axon through voltage-gated sodium channels. This influx of positive ions leads to a change in the electrical charge of the axolemma, causing depolarization. This depolarization allows the nerve impulse to propagate along the axon. Therefore, the movement of Na+ ions inside the axon is crucial for initiating and maintaining the electrical signaling in nerve conduction.
Hence, the correct answer is option 2.
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