Question 1

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

Accepted Answer

Muscularis externa

Question 2

A patient presents with a peptic ulcer caused by Helicobacter pylori. Which protective mechanism of the stomach has been compromised?

Accepted Answer

Mucus-secreting cells producing bicarbonate-rich mucus

Question 3

During digestion, which enzyme is responsible for the initial breakdown of starch in the oral cavity?

Accepted Answer

Amylase

Question 4

Which of the following best describes the function of the hepatic portal vein?

Accepted Answer

It delivers nutrient-rich blood from the digestive tract to the liver

Question 5

Which process is regulated by the enteric nervous system within the gastrointestinal tract?

Accepted Answer

Peristalsis and local secretions

Question 6

A patient has a blockage at the ileocecal sphincter. Which physiological process would be most directly affected?

Accepted Answer

Transfer of material from the small intestine to the large intestine

Question 7

Which of the following is a correct sequence of layers from the lumen outward in the alimentary canal?

Accepted Answer

Mucosa, Submucosa, Muscularis externa, Serosa

Question 8

Which cell type in the stomach secretes pepsinogen, the precursor to pepsin?

Accepted Answer

Chief cells

Question 9

If a patient’s pancreatic duct is blocked, which digestive process would be most impaired?

Accepted Answer

Chemical digestion of proteins, fats, and carbohydrates in the small intestine

Question 10

Which equation best represents the conversion of trypsinogen to trypsin in the small intestine?

Accepted Answer

$\mathrm{Trypsinogen} + \mathrm{Enteropeptidase} \rightarrow \mathrm{Trypsin}$

Question 11

Which anatomical feature increases the surface area for absorption in the small intestine?

Accepted Answer

Microvilli

Question 12

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

Accepted Answer

Pernicious anemia

Question 13

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

Accepted Answer

They emulsify lipids, increasing surface area for lipase action

Question 14

Which phase of gastric secretion is triggered by the sight, smell, or thought of food?

Accepted Answer

Cephalic phase

Question 15

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

Accepted Answer

Formation, storage, and elimination of feces

Question 16

Which vitamin is synthesized by mutualistic bacteria in the large intestine?

Accepted Answer

Vitamin B and K

Question 17

Which structure prevents food from entering the nasopharynx during swallowing?

Accepted Answer

Uvula

Question 18

Which of the following best explains why blood pH increases after food leaves the stomach?

Accepted Answer

Release of bicarbonate ions into the blood as HCl is produced in the stomach

Question 19

Which equation best represents the chemical digestion of starch by salivary amylase?

Accepted Answer

$\mathrm{Starch} + \mathrm{Amylase} \rightarrow \mathrm{Maltose}$

Question 20

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

Accepted Answer

Localized contractions that mix chyme and increase contact with absorptive surfaces

Digestive System: Structure and Function (Lecture 02, Chapter 23)

Study Guide - Practice Questions