polarized cell and impulse conuction

polarized cell: cell at rest
deopolarized cell: more positive than resting
hyperpolarized cell: more negative than resting



impulse conduction is affected by the following:
1. presence of myelin sheath
2. diameter of the axon

which means that myelinated neurons travels much faster than unmyelinated
In non-myelinated axons, the nerve impulse is going to be produced when the action potential accross a membrane makes a wave of depolarization followed by a wave of repolarization. With the absence of the myelin, the impulse is transmitted continuously throughout the membrane.
In a non-myelinated nerve, once an end of the cell, the dendrite, is depolarized, the depolarization a.k.a., the action potential, moves along the nerve membrane, and the area of membrane immediately behind the depolarized section becomes repolarized.