Signals are transmitted from one neuron to
another by using special chemicals, called
"neurotransmitters". The speed of these signals
depends on how fast the exchange of charged ions
is inside and outside of the cell membrane. The
main ions involved are sodium, potassium,
chloride, and calcium.
Without going into
details, I can say that messages in the brain can
travel at speeds up to 268 miles/hour.
order to learn more about this process, please go
to the next site, which I found not only very
didactic but also very interesting.click_here