Question 1

Which of the following best describes the primary function of the alimentary canal?

Accepted Answer

To digest and absorb food through a continuous muscular tube

Question 2

Which process involves the movement of digested end products from the lumen of the GI tract into the blood or lymph?

Accepted Answer

Absorption

Question 3

A patient has a blockage in the common hepatic duct. Which digestive process will be most directly affected?

Accepted Answer

Emulsification of fats in the small intestine

Question 4

Which layer of the alimentary canal is primarily responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 5

Which of the following is a correct equation for the formation of hydrochloric acid (HCl) in the stomach by parietal cells?

Accepted Answer

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

Question 6

Which of the following best explains why the stomach can accommodate large meals without a significant increase in internal pressure?

Accepted Answer

The presence of rugae and the plasticity of visceral smooth muscle

Question 7

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

Accepted Answer

Pernicious anemia

Question 8

Which of the following is a function of the enteric nervous system (ENS) in the digestive tract?

Accepted Answer

Regulation of GI tract motility through the myenteric plexus

Question 9

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

Accepted Answer

They emulsify fats, increasing surface area for pancreatic lipase action

Question 10

A patient presents with severe diarrhea after antibiotic treatment. Which of the following is the most likely cause?

Accepted Answer

Overgrowth of Clostridium difficile due to loss of normal gut flora

Question 11

Which of the following is the correct sequence of events during the swallowing (deglutition) reflex?

Accepted Answer

Buccal phase (voluntary) → Pharyngeal-esophageal phase (involuntary)

Question 12

Which of the following is a unique feature of the large intestine not found in the small intestine?

Accepted Answer

Teniae coli

Question 13

Which hormone is released in response to acidic chyme entering the duodenum and stimulates the pancreas to release bicarbonate-rich juice?

Accepted Answer

Secretin

Question 14

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

Accepted Answer

Cotransport with Na+ across the apical membrane and facilitated diffusion across the basolateral membrane

Question 15

Which of the following is the correct pathway for nutrient-rich blood from the small intestine to the liver?

Accepted Answer

Superior mesenteric vein → Hepatic portal vein → Liver

Question 16

Which of the following is a correct description of segmentation in the small intestine?

Accepted Answer

Nonadjacent segments of the intestine contract and relax, mixing food with digestive juices

Question 17

Which of the following is a function of the mucosa-associated lymphoid tissue (MALT) in the digestive tract?

Accepted Answer

Protection against microorganisms entering through the gut

Question 18

A patient with a low-fiber diet develops herniations of the mucosa in the colon wall. What is this condition called?

Accepted Answer

Diverticulosis

Question 19

Which of the following best explains why fat-soluble vitamins (A, D, E, K) are absorbed differently than water-soluble vitamins?

Accepted Answer

They are carried by micelles and diffuse into absorptive cells with lipids

Question 20

Which of the following is a direct result of the enterogastric reflex?

Accepted Answer

Inhibition of gastric secretion and motility when the duodenum is stretched or acidic

Chapter 23: The Digestive System – Structure, Function, and Physiology

Study Guide - Practice Questions