Question

Assertion : The axonal membrane of the neuron is more permeable to sodium ions ($N{a}^{+}$) and nearly impermeable to potassium ions ($K^{+}$).

Reason : In a resting state the neuron does not conduct any impulse.

• A. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
• B. If both Assertion and Reason are false.
• C. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
• D. If Assertion is true but Reason is false.

Answer 1

The correct option is B If both Assertion and Reason are false.

The axonal membrane or axolemma of the neuron is more permeable to potassium ions ($K^{+}$) and nearly impermeable to sodium ions ($N{a}^{+}$). In a resting state the neuron does not conduct any impulse. During this period the axoplasm inside the axon contains high concentration of negative charge. In contrast, the fluid outside the axon (ECF) contains a high concentration of positive charge.