Question 1

Which layer of the digestive tract is primarily responsible for absorption of nutrients and contains specialized epithelial cells and microvilli?

Accepted Answer

Mucosa

Question 2

During swallowing (deglutition), which phase involves the movement of the bolus from the oral cavity into the pharynx, and is under voluntary control?

Accepted Answer

Buccal phase

Question 3

A patient with a deficiency in intrinsic factor would most likely develop which condition?

Accepted Answer

Pernicious anemia

Question 4

Which enzyme, secreted in the oral cavity, initiates the chemical digestion of carbohydrates?

Accepted Answer

Salivary amylase

Question 5

The liver performs all of the following functions EXCEPT:

Accepted Answer

Absorption of nutrients

Question 6

Which structure prevents the reflux of stomach contents into the esophagus?

Accepted Answer

Lower esophageal sphincter

Question 7

If a patient has a blockage in the common bile duct, which digestive process would be most directly affected?

Accepted Answer

Emulsification of fats

Question 8

Which cell type in the stomach secretes pepsinogen, the precursor to the enzyme that digests proteins?

Accepted Answer

Chief cells

Question 9

The process of peristalsis in the esophagus is best described as:

Accepted Answer

Rhythmic contraction of smooth muscle to propel food

Question 10

Which of the following best describes the function of bile salts produced by the liver?

Accepted Answer

They emulsify fats to increase surface area for lipase action

Question 11

A patient with damage to the enteric nervous system would most likely experience problems with:

Accepted Answer

Motility and local control of digestive tract function

Question 12

Which equation best represents the reaction catalyzed by carbonic anhydrase in parietal cells during gastric acid secretion?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightarrow H_2CO_3 \rightarrow H^+ + $$HCO_3$$^-}$$

Question 13

Which of the following is NOT a function of the large intestine?

Accepted Answer

Digestion of proteins

Question 14

Which hormone is released in response to fatty chyme entering the duodenum and stimulates the release of bile and pancreatic enzymes?

Accepted Answer

Cholecystokinin (CCK)

Question 15

Which structure increases the surface area for absorption in the small intestine?

Accepted Answer

Intestinal villi

Question 16

During the gastric phase of digestion, which mechanism is primarily responsible for stimulating acid secretion?

Accepted Answer

Stretch receptors and gastrin release

Question 17

A patient with a damaged ileocecal valve would most likely experience:

Accepted Answer

Backflow of material from the large intestine into the small intestine

Question 18

Which of the following best describes the role of pancreatic bicarbonate in digestion?

Accepted Answer

It neutralizes acidic chyme entering the duodenum

Question 19

Which equation best represents the breakdown of starch by salivary amylase?

Accepted Answer

$$\mathrm{(C_6H_{10}O_5$)_n + H_2O \rightarrow maltose}$$

Question 20

A patient presents with jaundice and impaired fat digestion. Which organ is most likely dysfunctional?

Accepted Answer

Liver

The Digestive System: Structure, Function, and Regulation

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