1. The Oral Cavity--- a.k.a. ________MOUTH_____________

2. The Saltine Cracker Challenge!

3. Digestive System
Video

4. Major Functions of the Mouth
1. Initial analysis
2. Mech. process
3. Lubrication
Limited Digestion
** But NO absorption of nutrients

5. PARTS! 1. lips = labia 2. vestibule = space between cheeks and teeth
3. gingiva = gums
Can be paplated... 4. hard palate = most anterior roof of mouth
Can be paplated...  5. soft palate = posterior roof of mouth
6. uvula = hangs in back
7. Tongue  helps…
a. Mech. Processing… ( compression)
b. Assists in chewing
c. detects senses like touch/ temp/ taste
d. secretes mucus and the enzyme lipase
which  breaks down lipids

6. More Parts…. 8. frenulum = attaches tongue to floor of cavity
9. 3 pairs of Salivary Glands secrete 1 – 1.5L of saliva a day; pH = 7; 99.4 % water (0.6 % ions and amylase which begins absorption of carbs. A. Parotid ( ear) B. Sublingual (under tongue) C. Submandibular (posterior to teeth--- secretes Amylase)
10. Teeth perform Mastication = chewing
( which breaks down connective tissue of meat and fiber in plants
a. dentin = like bone ( non-living)
b. pulp cavity = blood and nerves
c. root canal = narrow base/ root of tooth
d. crown = visible part covered with enamel

7. Problems of the Oral Cavity
1. gingivitis = bacteria in gums
2. plaque = sticky matrix of food/ bacteria
3. tartar = hard calcified plaque
4. dental caries = cavities
5. root canal = removal of all bacteria in canal
6. impacted wisdom tooth = not enough room or out of place
** Floss daily to remove bacteria that a toothbrush can’t get to

8. 4 Main Types of Teeth w/diff. functions
1. incisors = cut/ clip… in front 2. cuspids (canines) = tear and slash 3. bicuspids (premolars) = crush/ mash/ grind 4. molars = crush/ grind

9. Dental Succession 1. Deciduous = primary/ milk/ baby 20
2. Permanent = secondary/ adult 32
Third molars = wisdom teeth

10. On a white sheet of paper….
Draw, color, label and title Fig pg. 406– include the names of teeth from Fig pg. 407
Draw, color, label and title Fig.15.9 pg. 408
Staple this paper to your Digestive Drawing from Friday after test (pg. 403)… due Wednesday!