Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 11 PCB Single Correct MCQ
Published on: August 13, 2026

Given below is the diagrammatic representation of impulse conduction through an axon.

Select the option with the incorrect information about impulse conduction at point A and B .

A
An electric current flows on the inner surface from site to and on outer surface, from site to to complete the circuit.
B
Action potential generated at site-A arrives at site B.
C
This current promotes opening of channels at site-B.
D
Polarity at the site-B is reversed and hence called repolarisation.

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Text Solution

Verified by Experts
The correct answer is:
D

A current flows on the inner surface from site A to site B.
On the outer surface, current flows from site to site A to complete the circuit of current flow. Hence, the polarity at the site is reversed, and an action potential is generated at site .
Thus, the impulse (action potential) generated at site A arrives at site B. The sequence is repeated along the length of the axon and consequently, the impulse is conducted.

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