Midterm paper

MODULE 9 LO3 Digestive Functions of Oral Cavity Dr. Lisa Brinn [email protected]

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3) Oral Cavity • Major functions:

v Food ingestion v Chewing and mixing of food v Begins chemical breakdown of carbohydrates v Moves food into the pharynx v Begins breakdown of lipids via lingual lipase

• Other functions: v Moistens and dissolves food v Cleans and lubricates teeth and oral cavity v Antimicrobial activity

Oral Cavity Accessory Organs • Lips and cheeks • Teeth • Tongue’s extrinsic muscles • Tongue’s intrinsic muscles • Taste buds • Lingual glands • Salivary glands

Oral Cavity Digestive Properties • Lingual lipase

v Secreted by lingual glands v Activated first in the stomach v Breaks down triglycerides

• Saliva v Water – 99.4% v Ions v Glycoproteins v Enzymes v Growth factors v Waste products

0.6%

o Salivary amylase o Bicarbonate ions o Phosphate ions o Mucus o IgA