Question

During conduction of nerve impulse

• A. N$a^{+}$ moves out of axoplasm
• B. N$a^{+}$ moves into axoplasm
• C. $K^{+}$ moves into axoplasm
• D. C$a^{2+}$ moves into axoplasm

Answer 1

The correct option is B N$a^{+}$ moves into axoplasm

B. Na+ moves into axoplasm

Reason: When the membrane of the neuron is at rest, the polarised neuron is less permeable to the Na+ ions as compared to the K+ due to the activity of the Na+-K+ pumps. When it gets stimulated, the voltage-gated Na+ channels turned open due to which the Na+ ions move from the extracellular fluid to the intracellular fluid of the axon. This causes depolarization of the membrane and the impulse is generated. This impulse moves down the axon in a similar depolarization wave. So the correct option is B.