Question 1

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

Accepted Answer

Absorption of most nutrients from digested food

Question 2

A patient is unable to absorb vitamin B12 efficiently, leading to anemia. Which gastric cell type is most likely malfunctioning, and what is the key substance it fails to produce?

Accepted Answer

Parietal cells; intrinsic factor

Question 3

During the process of swallowing (deglutition), which of the following correctly lists the sequence of phases?

Accepted Answer

Buccal, pharyngeal, esophageal

Question 4

Which of the following best explains why the stomach does not absorb significant amounts of nutrients?

Accepted Answer

The stomach lacks villi and microvilli to increase surface area for absorption.

Question 5

A patient with a blocked common bile duct would have difficulty digesting which type of nutrient, and why?

Accepted Answer

Lipids, because bile salts are necessary for emulsification

Question 6

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

Accepted Answer

It regulates local reflexes and motility independently of the CNS.

Question 7

A person consumes a meal high in protein. Which hormone is primarily released in response to protein in the stomach, and what is its main effect?

Accepted Answer

Gastrin; stimulates secretion of gastric juice

Question 8

Which of the following structures increases the absorptive surface area of the small intestine the most?

Accepted Answer

Intestinal villi and microvilli

Question 9

A patient has a mutation that inactivates carbonic anhydrase in parietal cells. Which of the following would most likely be affected?

Accepted Answer

Production of hydrochloric acid ($$\mathrm{HCl}) in $$the stomach

Question 10

Which of the following best describes the function of bile salts in digestion?

Accepted Answer

They emulsify fats, increasing surface area for lipase action.

Question 11

During the cephalic phase of digestion, which of the following occurs?

Accepted Answer

Gastric secretions are stimulated by the sight, smell, or thought of food.

Question 12

A patient with a damaged ileocecal valve would most likely experience which of the following?

Accepted Answer

Backflow of material from the large intestine into the small intestine

Question 13

Which of the following is a correct match between a digestive enzyme and its substrate?

Accepted Answer

Pancreatic lipase; triglycerides

Question 14

A patient with liver failure is unable to detoxify drugs efficiently. Which vascular structure is primarily responsible for delivering absorbed substances from the GI tract to the liver for processing?

Accepted Answer

Hepatic portal vein

Question 15

Which of the following best explains the 'alkaline tide' observed after a meal?

Accepted Answer

Increased bicarbonate ($$\mathrm{$$HCO_3$$^-}) $$enters the blood as parietal cells secrete $$\mathrm{H^+}$$ into the stomach.

Question 16

A person with a deficiency in pancreatic enzymes would have the most difficulty digesting which of the following?

Accepted Answer

Starch, proteins, and triglycerides

Question 17

Which of the following best describes the function of the large intestine?

Accepted Answer

Reabsorption of water and absorption of certain vitamins

Question 18

A patient is unable to form a proper bolus in the mouth. Which structure or process is most likely impaired?

Accepted Answer

Salivary glands and mastication

Question 19

Which of the following best explains why the pancreas secretes bicarbonate ($$\mathrm{$$HCO_3$$^-}) $$into the duodenum?

Accepted Answer

To neutralize acidic chyme from the stomach

Question 20

A patient with a genetic defect in brush border enzymes would most likely have difficulty digesting which of the following?

Accepted Answer

Disaccharides such as sucrose and lactose

The Digestive System: Structure, Function, and Regulation

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