Hepatocytes are excitable.

The excitability of a cell is an ability of a cell to produce action potential following exposure to a stimulus.

In a nerve cell, an action potential occurs following the rapid influx of Na+ into the cell.

The rapid influx of Na+ during an action potential is due to the opening of ligand-gated sodium channels.

Depolarization due to a stimulus must reach the potential threshold to produce an action potential.

Depolarization below the potential threshold is called graded potential.

The stronger the stimulus, the higher the amplitude of action potential produced.

During the repolarization phase of an action potential:

Sodium channels are closed

During the repolarization phase of an action potential:

There is efflux of potassium.

During the repolarization phase of an action potential:

Efflux of potassium occur actively

During the repolarization phase of an action potential:

Influx of chloride occur.

Hyperpolarization during an action potential is due to the slow closing of the voltage-gated K+ channels.

'Period A' is the Absolute Refractory Period of a nerve cell

A suprathreshold stimulus during 'Period B' will induce the production of another action potential.

During 'Period A' another action potential following stimulus at any strength cannot be produced because:

Regarding factors affecting the conduction velocity/ speed of action potential propagation:

Conduction velocity is high in a large diameter/thick axon.

Regarding factors affecting the conduction velocity/ speed of action potential propagation:

Conduction velocity is reduce in myelinated axon

Regarding factors affecting the conduction velocity/ speed of action potential propagation:

Conduction velocity is reduced in high temperature

Regarding factors affecting the conduction velocity/ speed of action potential propagation:

A lower pH level decreases the conduction velocity

Phases A is

Phases B is

Phases C is