The study of axons and action potentials enables us to understand

A) how Novocaine and other anesthetic drugs block pain.
B) why morphine and heroin are generally addictive.
C) why some people enjoy dairy products more than other people do.
D) why young adults generally have better memories than older people do.

Axons

Long, slender projections of nerve cells, or neurons, that transmit electrical impulses away from the neuron's body to other neurons, muscles, or glands.

Action Potentials

Electrical impulses that neurons generate to transmit information throughout the nervous system.

Novocaine

A synthetic compound used as a local anesthetic, particularly in dentistry.