Digestive System Functions and Processes

Chib from KY School of Innovation explains the digestion process, starting with mechanical digestion in the mouth, where food is chewed and mixed with saliva. The food then moves to the stomach for protein digestion with gastric acid, protected by mucus. Afterward, it enters the small intestine, where enzymes and bile aid in digestion and nutrient absorption. Finally, waste is processed in the large intestine and eliminated.

What is the primary function of digestion in the body?

• To convert water into food

• To transform insoluble food into soluble food

• To store food for later use

• To eliminate waste immediately

What initiates the process of mechanical digestion?

• Swallowing

• Chewing

• Stomach acid

• Enzyme secretion

What is the role of saliva in digestion?

• To neutralize stomach acid

• To dissolve proteins

• To form a bolus

• To dry the food

Where does protein digestion begin?

• In the small intestine

• In the mouth

• In the esophagus

• In the stomach

What protects the stomach from digesting itself?

• A layer of fat

• A special enzyme

• A thick muscle wall

• Mucus

What is the chyme?

• A type of enzyme

• A digestive hormone

• Partially digested food

• A section of the intestine

Where does the majority of nutrient absorption occur?

• In the esophagus

• In the small intestine

• In the stomach

• In the large intestine

What percentage of nutrients is absorbed into the blood in the small intestine?

• 50%

• 75%

• 95%

• 100%

What happens to the remaining 5% of the food that is not absorbed in the small intestine?

• It is stored in the liver

• It is excreted as waste

• It is converted into energy

• It is absorbed in the stomach