$$\text{Triglyceride} \xrightarrow{\text{pancreatic lipase}} \text{Monoglyceride} + 2\ \text{Fatty Acids}$$

$$\text{Nucleic Acid} \xrightarrow{\text{pancreatic nucleases}} \text{Nucleotide Monomers}$$

Question 1

Which process increases the surface area available for pancreatic lipase action during fat digestion in the small intestine?

Accepted Answer

Emulsification by bile salts

Question 2

What is the primary function of pancreatic lipase in the digestion of lipids?

Accepted Answer

Breaks down triglycerides into monoglycerides and two free fatty acids

Question 3

After micelle formation, how do lipid digestion products enter the absorptive cells of the intestinal epithelium?

Accepted Answer

Simple diffusion

Question 4

Which of the following best describes the path of absorption for chylomicrons after they are formed in the intestinal epithelial cells?

Accepted Answer

Into lymphatic lacteals and then emptied into venous blood at the thoracic duct

Question 5

Short-chain fatty acids differ from long-chain fatty acids in their absorption because:

Accepted Answer

They diffuse directly into the blood

Question 6

Which equation best represents the breakdown of a triglyceride by pancreatic lipase?

Accepted Answer

$$	ext{Triglyceride} \xrightarrow{	ext{pancreatic lipase}} 	ext{Monoglyceride} + 2\ 	ext{Fatty Acids}$$

Question 7

Which vitamin requires binding to intrinsic factor for absorption in the small intestine?

Accepted Answer

Vitamin B12

Question 8

Iron absorption in the small intestine is regulated by:

Accepted Answer

Transferrin and ferritin

Question 9

Which of the following is a plausible consequence of malabsorption due to celiac disease?

Accepted Answer

Immune cell damage to intestinal villi and brush border

Question 10

During embryonic development, the oral membrane forms when:

Accepted Answer

The foregut fuses with the stomodeum

Question 11

Which process is responsible for the absorption of most water in the digestive tract?

Accepted Answer

Osmosis in the small intestine

Question 12

Which equation best represents the hydrolysis of nucleic acids by pancreatic nucleases?

Accepted Answer

$$	ext{Nucleic Acid} \xrightarrow{	ext{pancreatic nucleases}} 	ext{Nucleotide Monomers}$$

Question 13

Which of the following is a plausible effect of cystic fibrosis on the digestive system?

Accepted Answer

Blockage of the pancreatic duct by thick mucus

Question 14

Which step in fat digestion is directly facilitated by bile salts?

Accepted Answer

Emulsification

Question 15

Which of the following statements about vitamin absorption is correct?

Accepted Answer

Water-soluble vitamins are absorbed by diffusion or passive/active transporters

Question 16

A patient with damaged intestinal mucosa is likely to experience malabsorption because:

Accepted Answer

Absorptive surface area is reduced

Question 17

Which equation best represents the absorption of water in the small intestine?

Accepted Answer

$$	ext{Water Uptake} = 	ext{Net Osmosis}$$

Question 18

Which developmental event marks the formation of a continuous alimentary canal from mouth to anus?

Accepted Answer

By week 5 of embryonic development

Question 19

Which of the following is a plausible effect of aging on the digestive system?

Accepted Answer

Decline in GI tract activity and efficiency of absorption

Question 20

Which equation best represents the coupling of sodium absorption with glucose and amino acid absorption?

Accepted Answer

$$	ext{Na}^+ 	ext{ Absorption} \sim 	ext{Active Absorption of Glucose and Amino Acids}$$

Digestion and Absorption in the Human Digestive System

Study Guide - Practice Questions