Acetylcholine is broken down by

In a neurone, impulses are carried away from the cell body by the

A myelinated neurone conducts impulses faster than an unmyelinated one because

The resting potential of about minus 70 millivolts across the membrane of a neurone is maintained mainly by

The rapid depolarisation phase of an action potential is caused by

The all or none law of nerve impulse conduction states that