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Chapter 1 Vocabulary

Across
A bundle of nerves found in the backbone
sound vibrations traveling through the air
the black hole in the center of the eye that becomes smaller or larger to control the amount of light that enters the eye
the liquid waste that is given off through the pores of the skin
The system of nerves which includes the brain, the nerves, and the spinal cord
the colored part of the eye that controls the size of the pupil
the part of the inner ear which is filled with liquid that stimulates the auditory nerve
the little bumps on the tongue which contain nerves for the sense of taste
Down
The fibers that carry messages to and from the brain
the nerve which carries the message of hearing to the brain
tiny particles of a substance
the protective crust that forms over a wound when your skin has been cut
– the nerve which carries the message of sight to the brain
the tiny holes in the skin
the parts of the body that are designed to help you react to things around you
to move rapidly back and forth