Question

When dental work is to be done, the gums and nerves in the teeth are anethetized by injection of lidocaine. This drug blocks Na+ channels in the membrane of the sensory cells.
This drug is an effective local anesthetic because the
A. Sensory cell membrane do not repolarize after impulses are sent
B. Sensory cell membranes do not depolarize and create impulses
C. Neurotransmitters are in sensory pathway are not released
D. Neurotransmitters are destroyed before the post synaptic neuron is stimulated