Helmholtz's finding that the nerve impulse traveling through the body is considerably

slower than electricity traveling through a wire, led to the important realization that

a. the nerve impulse is not electrical in its nature.
b. nerve impulses are more complex than simple electrical current.
c. specific structures within the body impede the speed with which
electrical current travels through the nervous system.
d. the brain and nervous system could be studied safely by stimulating them with weak
electrical current.
e. electrical stimulation of the body could potentially damage the nervous system.

b. nerve impulses are more complex than simple electrical current.