Digestive system

Where does digestion begin?

• a) Stomach
  

• b) Small intestine
  

• c) Mouth

• 
  d) Esophagus

What is the function of ptyalin in digestion?

• a) It breaks down proteins
  

• b) It converts starch into maltose
  

• c) It absorbs water
  

• d) It kills bacteria

What is the role of bile in digestion?

• a) It breaks down proteins

• b) It moistens food for swallowing

• c) It breaks down fats and oils

• d) It digests carbohydrates

Where are nutrients from digested food absorbed into the blood?

• a) Large intestine
  

• b) Small intestine
  

• c) Stomach

• 
  d) Esophagus

The __________ releases enzymes that help break down lipids, proteins, and carbohydrates.

______ protects the inner lining of the stomach from hydrochloric acid

How does the stomach help in digestion?

• A) It absorbs all nutrients from food.

• 
  B) It stores food without breaking it down.
  

• C) It churns food, mixes it with gastric juices, and uses acid and enzymes to break down proteins.
  

• D) It directly transports food to the intestines without processing.

What happens to undigested food in the large intestine?