Mouth's Role in Digestion: Anatomy and Function

Structures That Initiate Digestion

Mechanically break down food; incisors cut, canines tear, premolars/molars grind.

Mixes food with saliva, forms bolus, moves food for chewing and taste perception.

Detect sweet, sour, bitter, salty, umami; influence preferences and saliva flow.

Contains water, electrolytes, mucus, and salivary amylase (starts starch digestion); lubricates for swallowing.

Hard palate (bone) and soft palate (muscle) separate oral and nasal cavities; soft palate rises during swallowing.

Flap covering trachea during swallowing to prevent aspiration.

Muscular tube propelling bolus to esophagus via peristalsis.

Together, these structures physically and chemically prepare food for the stomach and small intestine.