Question 1

Which of the following correctly lists the layers of the alimentary canal wall from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 2

A patient presents with difficulty digesting fats due to a blocked duct. Which accessory organ is most likely affected, and what is its primary digestive function?

Accepted Answer

Gallbladder; stores and concentrates bile for fat emulsification

Question 3

Which structural specialization of the small intestine increases its surface area for absorption, and what is the correct order from largest to smallest?

Accepted Answer

Circular folds, villi, microvilli

Question 4

Which cell type in the gastric glands secretes hydrochloric acid, and what is the main function of this secretion?

Accepted Answer

Parietal cell; activates pepsinogen and destroys pathogens

Question 5

A histological slide shows simple columnar epithelium with gastric pits and glands. Which organ is being observed, and what is the primary function of the chief cells found here?

Accepted Answer

Stomach; secretion of pepsinogen for protein digestion

Question 6

Which of the following best describes the flow of blood through a liver lobule?

Accepted Answer

Blood enters via the portal triad, flows through sinusoids, and exits via the central vein

Question 7

Which structure prevents food from entering the trachea during swallowing, and what is its anatomical location?

Accepted Answer

Epiglottis; superior to the glottis and anterior to the esophagus

Question 8

A patient has a deficiency in intrinsic factor production. Which cell is malfunctioning, and what is a likely consequence?

Accepted Answer

Parietal cell; vitamin B12 deficiency leading to pernicious anemia

Question 9

Which of the following is a correct pairing of a tooth type and its primary function?

Accepted Answer

Incisor; cutting food

Question 10

Which component of the portal triad carries nutrient-rich blood from the digestive tract to the liver?

Accepted Answer

Hepatic portal vein

Question 11

A biopsy of the small intestine reveals numerous Peyer’s patches. In which region of the small intestine are these structures most abundant, and what is their function?

Accepted Answer

Ileum; immune surveillance and protection

Question 12

Which of the following best describes the function of lacteals in the small intestine?

Accepted Answer

Absorption of dietary lipids into the lymphatic system

Question 13

Which structure connects the oral cavity to the oropharynx and is involved in speech and swallowing?

Accepted Answer

Soft palate

Question 14

A patient with a peptic ulcer in the duodenum is found to have decreased secretion from Brunner’s glands. What is the primary function of these glands?

Accepted Answer

Secretion of alkaline mucus to neutralize gastric acid

Question 15

Which of the following best describes the difference between villi and microvilli in the small intestine?

Accepted Answer

Villi are multicellular projections; microvilli are microscopic extensions of individual epithelial cells

Question 16

Which of the following equations correctly represents the relationship between the number of deciduous teeth ($$D$$), permanent teeth ($$P$$), and total teeth ($$T) in an $$adult human?

Accepted Answer

$$T = P$$

Question 17

Which structure anchors the tooth to the surrounding alveolar bone?

Accepted Answer

Periodontal ligament

Question 18

A patient with liver disease has impaired bile production. Which process in the digestive system will be most affected?

Accepted Answer

Emulsification and absorption of dietary fats

Question 19

Which of the following best describes the function of the muscularis externa in the alimentary canal?

Accepted Answer

Responsible for peristalsis and segmentation

Question 20

Which of the following is a correct description of the portal triad found in the liver lobule?

Accepted Answer

It consists of a branch of the hepatic artery, a branch of the hepatic portal vein, and a bile duct

Digestive System: Structure, Function, and Histology

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