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