Question 1

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

Accepted Answer

They emulsify large lipid globules into smaller ones, increasing surface area for pancreatic lipase action.

Question 2

A patient has a mutation that prevents the production of intrinsic factor in the stomach. Which of the following is the most likely consequence?

Accepted Answer

Impaired absorption of vitamin B12, leading to anemia.

Question 3

During the process of swallowing (deglutition), which phase is under voluntary control?

Accepted Answer

Oral phase

Question 4

Which of the following enzymes is responsible for the initial chemical digestion of starch in the mouth?

Accepted Answer

Salivary amylase

Question 5

A patient with a cholecystectomy (removal of the gallbladder) is most likely to experience which of the following after eating a large, fatty meal?

Accepted Answer

Severe indigestion due to impaired bile storage and release

Question 6

Which of the following best explains why prolonged vomiting can lead to metabolic alkalosis?

Accepted Answer

Loss of gastric juice, which contains hydrochloric acid, increases blood bicarbonate levels.

Question 7

Which of the following statements about the enteric nervous system is correct?

Accepted Answer

It is capable of functioning independently of the central nervous system.

Question 8

Which of the following is the correct order of tissue layers from the lumen outward in the GI tract?

Accepted Answer

Mucosa, submucosa, muscularis, serosa

Question 9

A patient with lactose intolerance lacks sufficient activity of which enzyme, and what is the physiological consequence in the colon?

Accepted Answer

Lactase; undigested lactose is fermented by bacteria, producing gas and diarrhea.

Question 10

Which of the following best describes the function of the lower esophageal sphincter (LES)?

Accepted Answer

It prevents the backflow of stomach contents into the esophagus.

Question 11

Which of the following is NOT a function of the liver?

Accepted Answer

Secretion of digestive enzymes into the duodenum

Question 12

Which of the following statements about absorption in the small intestine is correct?

Accepted Answer

All water absorption occurs via osmosis from the intestinal lumen to the capillaries.

Question 13

Which of the following best explains the role of the hormone cholecystokinin (CCK) in digestion?

Accepted Answer

It stimulates the gallbladder to contract and release bile into the duodenum.

Question 14

A patient presents with severe abdominal pain after consuming a fatty meal. Imaging reveals gallstones blocking the common bile duct. Which of the following is the most likely consequence?

Accepted Answer

Impaired emulsification and absorption of dietary fats

Question 15

Which of the following enzymes is secreted in an inactive form and activated in the stomach by acidic pH?

Accepted Answer

Pepsinogen

Question 16

Which of the following best describes the process of peristalsis in the GI tract?

Accepted Answer

Coordinated contractions of circular and longitudinal muscles that propel food forward

Question 17

Which of the following is a function of the bacteria (flora) in the large intestine?

Accepted Answer

Fermentation of undigested carbohydrates, producing gases and some vitamins

Question 18

A patient with chronic pancreatitis is likely to have difficulty digesting which of the following macronutrients?

Accepted Answer

Proteins, carbohydrates, and fats

Question 19

Which of the following best explains why the stomach is able to protect itself from the acidic gastric juice it produces?

Accepted Answer

A layer of alkaline mucus coats the stomach lining

Question 20

Which of the following is the main site for absorption of most nutrients in the digestive tract?

Accepted Answer

Small intestine

The Digestive System: Structure, Function, and Processes

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