Concept: This question tests your understanding of the basic terminology used to describe the electrical signals transmitted by neurons.

Why (B) is correct: A wave of action potential that travels along the length of a neuron is specifically called a nerve impulse. This is the fundamental unit of communication in the nervous system.

Why other options are wrong:

• (A) sensory impulse: A sensory impulse is a type of nerve impulse that originates from sensory receptors and travels towards the central nervous system. It's a specific kind of nerve impulse, not the general term for an action potential wave.
• (C) activation impulse: This is not a standard biological term for an action potential.
• (D) motor impulse: A motor impulse is a type of nerve impulse that travels from the central nervous system to effector organs (like muscles or glands). It's also a specific kind of nerve impulse.

Common Mistake: Students might confuse the general term "nerve impulse" with its specific types like "sensory" or "motor" impulses. Remember that a nerve impulse is the overarching term for the electrical signal.

NEET Tip / Mnemonic: Think of "Action Potential" as the electrical event at one point, and "Nerve Impulse" as that event propagating like a wave along the neuron. Action Potential Needs Impulse.

Correct Answer: (B)