How many of the following are true about a polarised axonal membrane?
(a) The outer surface possesses Na⁺ as positive charge.
(b) It is impermeable to negatively charged proteins present in the axoplasm.
(c) The inner surface possesses organic proteins as negative charge.
(d) It is more permeable to K⁺ and nearly impermeable to Na⁺.

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(a), (c), and (d) only

(a), (b) and (c) only

(a) and (b) only

(a), (b), (c) and (d)

answer is D.

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Detailed Solution

The outer surface of a resting axonal membrane possesses Na⁺ as positive charge while its inner surface possesses organic proteins as negative charge. It is comparatively more permeable to K⁺ and nearly impermeable to sodium ions Na⁺. It is impermeable to negatively charged proteins present in the axoplasm.

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