Question 1

Which of the following best describes the primary function of the mesenteries in the digestive system?

Accepted Answer

They anchor and stabilize the digestive organs and provide a pathway for blood vessels, nerves, and lymphatics.

Question 2

During the gastric phase of digestion, which of the following events is most likely to occur?

Accepted Answer

Increased secretion of HCl and pepsinogen due to stomach distension and presence of peptides.

Question 3

Which of the following is a correct sequence of layers from the lumen outward in the wall of the digestive tract?

Accepted Answer

Mucosa, submucosa, muscular layer, serosa

Question 4

A patient with a deficiency in brush border enzymes in the small intestine would most likely experience which of the following symptoms?

Accepted Answer

Difficulty digesting and absorbing disaccharides, leading to osmotic diarrhea.

Question 5

Which hormone is primarily responsible for stimulating the contraction of the gallbladder and the release of bile into the duodenum?

Accepted Answer

Cholecystokinin (CCK)

Question 6

Which of the following best explains why fat-soluble vitamins (A, D, E, K) can accumulate to toxic levels in the body?

Accepted Answer

They are stored in the liver and adipose tissue and not readily excreted.

Question 7

Which of the following statements about peristalsis is correct?

Accepted Answer

It is a wave of contraction in the circular muscle layer that propels the bolus forward.

Question 8

A patient with liver failure is most likely to experience which of the following complications related to digestion?

Accepted Answer

Reduced bile production leading to fat malabsorption

Question 9

Which of the following best describes the role of the microbiome in the large intestine?

Accepted Answer

It synthesizes vitamins such as K2, biotin, and B5, and ferments undigested food.

Question 10

Which of the following is the correct pathway for the absorption of dietary lipids?

Accepted Answer

Absorbed as chylomicrons into lacteals, then transported via the thoracic duct to the left subclavian vein.

Question 11

Which of the following best explains why elderly individuals are at increased risk for dehydration?

Accepted Answer

They have a reduced thirst sensation and decreased epithelial stem cell division.

Question 12

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

Accepted Answer

Compaction, storage, and elimination of fecal matter

Question 13

Which of the following best describes the function of parietal cells in the stomach?

Accepted Answer

Secretion of hydrochloric acid (HCl) and intrinsic factor

Question 14

A patient with lactose intolerance is unable to digest lactose due to a deficiency in which enzyme?

Accepted Answer

Lactase

Question 15

Which of the following best describes the effect of sympathetic stimulation on the digestive system?

Accepted Answer

It inhibits gastrointestinal activity and motility.

Question 16

Which of the following is the main function of bile salts in the digestive process?

Accepted Answer

They emulsify dietary fats, increasing surface area for lipase action.

Question 17

Which of the following best explains why neonates are at higher risk for feeding intolerance and infection?

Accepted Answer

They have immature GI motility, limited enzyme production, and underdeveloped immune function.

Question 18

Which of the following is a correct statement about water absorption in the digestive tract?

Accepted Answer

Most water absorption occurs in the small intestine via osmosis.

Question 19

Which of the following best describes the role of the hepatic portal system?

Accepted Answer

It transports nutrient-rich blood from the digestive tract to the liver for processing.

Question 20

Which of the following is the correct formula for the hydrolysis of a disaccharide into two monosaccharides?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11} + H_2O \rightarrow 2C_6H_{12}$$O_6$$}$

The Digestive System: Structure, Function, and Regulation

Study Guide - Practice Questions