Lesson 8.3: Keeping Your Mouth, Eyes, and Ears Healthy | Crossword
Across
5. | the part of the middle ear that vibrates in response to sound |
6. | an inflammation of the gums |
8. | the black opening in the middle of the iris through which light passes |
10. | the colored part of the eye that constricts and dilates the pupil |
11. | a spiral tube in the inner ear that senses sound vibrations and transmits them to the auditory nerve |
12. | the area of your mouth that includes the lips, teeth, and tongue |
13. | the tissue by which nerve impulses travel from the retina to the brain |
14. | the units by which sound intensity, or loudness, is measured |
Down
1. | the clear tissue covering the front of the eye |
2. | an infection in which bacteria gets beneath the gums and destroys gum and bone |
3. | the condition of having bad-smelling breath |
4. | the innermost, light-sensitive area of the eye, composed of photoreceptors that convert light into nerve impulses and electrical signals |
7. | a substance produced in the mouth, which contains enzymes that break down food |
9. | a sticky, colorless substance formed by bacteria in the mouth; coats the teeth and slowly dissolves enamel |
11. | holes in the teeth caused by plaque eating away at tooth enamel |
15. | a clear part of the eye that focuses light on the retina |