Question 1

Which of the following best describes the primary function of bile salts in the digestive process?

Accepted Answer

They emulsify lipids, increasing surface area for enzymatic digestion.

Question 2

A patient with chronic gastroesophageal reflux disease (GERD) is at increased risk for which of the following cellular changes in the esophagus?

Accepted Answer

Transformation from stratified squamous to columnar secretory epithelium

Question 3

Which hormone is released from the small intestine in response to fatty chyme and stimulates the gallbladder to contract?

Accepted Answer

Cholecystokinin (CCK)

Question 4

Which of the following is a correct sequence of events for the chemical digestion of starch?

Accepted Answer

Salivary amylase in the mouth → inactivation in the stomach → pancreatic amylase in the small intestine

Question 5

Which of the following best explains why fecal transplants are effective in treating recurrent Clostridium difficile infections?

Accepted Answer

They restore a healthy microbiome that outcompetes C. difficile.

Question 6

Which layer of the GI tract wall is primarily responsible for peristalsis and mixing movements?

Accepted Answer

Muscularis

Question 7

A patient has a mutation that impairs the function of parietal cells. Which of the following consequences is most likely?

Accepted Answer

Reduced production of hydrochloric acid and intrinsic factor

Question 8

Which of the following best describes the role of the enteric nervous system (ENS) in the digestive tract?

Accepted Answer

It functions independently of the CNS to regulate GI motility and secretion.

Question 9

Which of the following is a function of the large intestine?

Accepted Answer

Compaction of watery chyme into feces and absorption of water and electrolytes

Question 10

A patient with a deficiency in pancreatic lipase would have difficulty digesting which macronutrient?

Accepted Answer

Lipids

Question 11

Which of the following best describes the process of absorption in the small intestine?

Accepted Answer

Transport of digested molecules, electrolytes, and vitamins from the GI tract into blood or lymph

Question 12

Which of the following is a correct statement about the regulation of digestive processes?

Accepted Answer

Long reflexes involve sensory input to the CNS and autonomic motor output.

Question 13

Which of the following is a direct effect of secretin released from the small intestine?

Accepted Answer

Stimulates the pancreas to release alkaline pancreatic juice

Question 14

Which of the following best explains why the stomach does not digest itself under normal conditions?

Accepted Answer

Surface mucous cells secrete alkaline mucin that protects the epithelium.

Question 15

Which of the following is the correct chemical equation for the neutralization of acidic chyme by bicarbonate ions in the small intestine?

Accepted Answer

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

Question 16

A patient with a blockage in the common bile duct would have difficulty digesting which of the following?

Accepted Answer

Lipids

Question 17

Which of the following best describes the function of Kupffer cells in the liver?

Accepted Answer

Line sinusoids and clear harmful substances from blood

Question 18

Which of the following is a plausible consequence of a loss of function in the myenteric plexus of the GI tract?

Accepted Answer

Reduced motility and peristalsis throughout the GI tract

Question 19

Which of the following best explains why a high-fat meal delays gastric emptying?

Accepted Answer

Fatty acids stimulate the release of CCK, which inhibits gastric motility.

Question 20

Which of the following is the correct sequence for the phases of swallowing?

Accepted Answer

Voluntary phase → Pharyngeal phase → Esophageal phase

Digestive System: Structure, Function, and Microbial Interactions

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