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Lesson 8.3: Keeping Your Mouth, Eyes, and Ears Healthy | Check Your Understanding
_____ contains an enzyme that helps break down food in the mouth.
Which part of the tooth contains blood vessels and nerve endings that connect the tooth to the jaw?
A. the crown
B. the neck
C. the root
D. enamel
_____ is a sticky, colorless film that coats the teeth and dissolves their protective enamel surface.
Inflammation of the gums is called _____.
A. gingivitis
B. periodontitis
C. halitosis
D. bruxism
True or false?
Periodontitis is an infection that occurs when bacteria gets under the gum tissue and begins to destroy the gums and bone.
A. True
B. False
The _____ is the colored part of the eye.
A. iris
B. pupil
C. lens
D. retina
True or false? Myopia
is another term for astigmatism.
A. True
B. False
Briefly describe the three main parts of the ear—the outer ear, middle ear, and inner ear. What functions do each part of the ear have?
Which of the following is another name for the outer ear?
A. anvil
B. cochlea
C. pinna
D. ear canal
Sound intensity is measured in units called _____.
Critical Thinking.
What choices can you make now to help you enjoy healthy teeth for years to come?
Critical Thinking.
If you had the choice, would you prefer to correct your vision with surgery or to wear eyeglasses or contacts? Explain.
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