Digestive System Physiology Secretions and Absorption

Bile juice helps in the digestion of fat because it contains

• enzymes

• vitamins

• bile salts

• bile pigments

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

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

The liver is said to be a digestive gland because it

• converts stored glycogen into glucose

• breaks down excess amino acids

• produces bile

• stores iron

Protein digestion occurs mainly in

• 1 and 3

• 2 and 3

• 2 and 5

• 3 and 5

Tags

NGSS.MS-LS1-3

Bile is a digestive juice in our body. Which of the following statements about bile is correct?

• It is produced by the gall bladder.

• It contains an enzyme that digests fat.

• It helps break down fat into droplets.

• It stimulates peristaltic movement of the small intestine.

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

Tags

NGSS.MS-LS1-3

Which structure(s) will produce the enzyme(s) needed for the digestion of egg white?

• X only

• X and Y only

• Y and Z only

• X, Y and Z