Digestive Physiology (Unit 8 Standard B)

The enzymatic breakdown of large molecules into their basic building blocks is called

• absorption

• secretion

• mechanical digestion

• chemical digestion

Intrinsic factor and hydrochloric acid are secreted by cells in the stomach wall called

• Parietal cells

• Chief cells

• Acinar cells

• G cells

What hormone is secreted from the small intestine when chyme arrives, which contains lipids and partially digested proteins?  It works in the pancreas to accelerate the production and secretion of all types of digestive enzymes.

• Gastrin

• Secretin

• CCK

• Enterocrinin

Which enzyme doesn’t break down polypeptides into short peptides and amino acids?

• Trypsin

• Bile salts

• Chymotrypsin

• Elastase

 Which of the following DOESN’T play a role in the breakdown of carbohydrates?

• Maltase, sucrase, lactase

• Pancreas

• Mouth

• Pancreatic lipase

Which of the following DOESN’T play a role in the breakdown of lipids?

• Pancreas

• Pancreatic amylase

• Bile salts

• Pancreatic lipase

What enzyme in the stomach is activated by hydrogen ions and breaks proteins into polypeptides?

• Amylase

• Lipase

• Pepsin

• Maltase

Place the following steps of protein digestion in order from earlier in the digestive process to later:

I. Exopeptidases and dipeptides secreted from the brush border of the small intestine break down short peptides into amino acids

II. In the stomach, pepsin breaks down proteins into polypeptides. 

III. Enterokinase activates trypsin, which breaks proteins into short-chain peptides.

IV. Mechanical digestion in the mouth breaks down complex proteins into simpler ones.

• IV, II, III, I

• IV, II, I, III

• II, IV, III, I

• I, III, II, IV