| A | B |
|---|
| Skin | complicated organ that protects you from disease |
| Ultra-violet rays | invisible rays given off by the sun |
| Sunscreen | worn for protection from the sun |
| Gingivitis | gum disease that occurrs when plaque hardens on your teeth |
| Permanent teeth | teeth you will have for the rest of your life |
| Orthodontia | correction of crooked teeth |
| Dental appliances | devices used to straighten teeth |
| Iris | colored part of the eye |
| pupil | black center of the eye |
| Optic nerve | sends sight signals to the brain |
| Blood pressure | the force of blood pushing against the wals of the arteries |
| Cardiovascular fitness | condition of having a healthy circulatory system |
| Muscular endurance | allows you to use your muscles withouot getting tired |
