Digestive 6.2 Checking for Understanding

The micrograph is of a longitudinal section through the small intestine. Which letter represents the circular muscle layer?

• A

• B

• C

• D

Which part of the body secretes amylase, lipase and endopeptidase for use in the digestion of food?

• Mouth

• Pancreas

• Stomach

• Small Intestine

Where in the human body is lipase produced?

• Stomach

• Pancreas

• Gall bladder

• Liver

What are these structures?

• Fatty acids in the small intestine

• Bacteria in the large intestine

• Villi in the small intestine

• Feces egested from the large intestine

Which products are formed by the action of the enzymes protease and amylase?

• A

• B

• C

• D

The diagram shows the human digestive system. Which organ is responsible for the majority of the absorption of digested food?

• A

• B

• C

• D

Bacteria from chicken feces can cause a loss of intestinal villi in small children who happen to eat dirt in rural villages. Which effect could be expected from such a loss of villi?

• Insufficient absorption of starch

• Failure to digest dietary fiber

• Malnutrition

• An increase in microvilli

Glucose is absorbed through protein channels in the plasma membrane of epithelium cells in the small intestine. Which characteristics of glucose prevent its diffusion through the phospholipid bilayer?

• It is non-polar and therefore hydrophobic.

• Its hydrogen bonds link with amino acids in the protein channel.

• It is polar and therefore hydrophilic.

• Its covalent bonds interact with the phospholipids.

What is the main method of transport of monosaccharides such as fructose across the intestinal epithelium?

• Osmosis

• Facilitated diffusion

• Endocytosis

• Active transport

The diagram shows the layers of the tissues in a transverse section of the human small intestine.

Which is the layer labelled with the letter X?

• Mucosa

• Circular muscle

• Epithelium

• Longitudinal muscle