Question

Assertion (A): A nerve impulse is an electrochemical event.

Reason (R): In a nerve impulse there are changes in the resting potential which spreads down the nerve fibre.

Options

• Both A and R are True.

• A is True, R is False.

• A is False but R is True.

• Both A and R are False.

Answer 1

Both A and R are True.

Explanation:

A nerve impulse is a true electrochemical event because it relies on chemical ion movements to generate an electrical signal along the neuron's membrane. The fundamental mechanism behind this event is a localised disruption in the resting potential (depolarisation), which ripples sequentially down the nerve fibre to propagate the signal. Because this spreading wave of potential changes is precisely what constitutes the electrochemical event, the reason directly and accurately explains the assertion.