Life Science Glencoe Digestion

The stomach wall produces mucus to cover its surface. Which of the following statements correctly describe(s) the function of the mucus?

(1) It kills the bacteria in the ingested food.

(2) It prevents the rubbing of food against the stomach wall.

(3) It protects the stomach wall from the action of the digestive enzymes.

• (1) only

• (3) only

• (1) and (2) only

• (2) and (3) only

Protein digestion occurs mainly in

• 1 and 3

• 2 and 3

• 2 and 5

• 3 and 5

Chemical digestion of carbohydrate occurs in

• 1 and 2 only

• 1 and 4 only

• 2 and 3 only

• 3 and 4 only

Peristalsis occurs in

• 1, 2 and 3 only

• 1, 2 and 4 only

• 1, 3 and 4 only

• 2, 3 and 4 only

Physical digestion takes place at

• 1 and 3

• 1 and 4

• 3 and 4

• 1, 3 and 4

Waves of contractions that move food one way through the digestive system are called

• Impulse

• Peristalsis

• Action Potential

• Metabolism

What is the function of the gall bladder? *2015 Q26

• absorption of fat

• digestion of fat

• production of bile

• storage of bile

Bile juice helps in the digestion of fat because it contains

• enzymes

• vitamins

• bile salts

• bile pigments

In the alimentary canal, most water is absorbed in the

• oesophagus

• stomach

• small intestine

• colon

In the alimentary canal, bacteria in food are mainly killed by

• saliva

• mucus

• gastric juice

• pancreatic juice