How does the nervous system keep in touch with what is happening inside and outside the body?
How do you know?
A
It uses memory; "It is the center of all
mental activity including thought, learning
and memory."
B.
It uses blood; "Blood and connective tissues
are also part of the nervous system."
С
It uses sensory receptors; "Millions of
sensory receptors, or specialized cells,
detect changes called stimuli."
D
It uses glands; "Glands release substances
like hormones that help control how cells
and organs work."