Question

The figure below shows events of nerve impulse conduction. Select the option giving correct identification together what it represents?

• A. Figure [A] – Site (a) is showing repolarisation
• B. Figure [B] – Site (c) is showing hyper polarisation
• C. Figure [A] & [B] – Site (a) is showing depolarization
• D. Figure [B] – Site (a) is in refractory period

Answer 1

The correct option is D Figure [B] – Site (a) is in refractory period

Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals.

The following four steps describe the initiation of an impulse to the “resetting” of a neuron to prepare for a second stimulation:

• Action potential
• Repolarization
• Hyperpolarization
• Refractory period

Site (a) is in refractory period