Question 1

Which of the following best explains why the small intestine has such an extensive blood supply, as seen in the scanning electron micrograph of its vasculature?

Accepted Answer

To rapidly absorb digested nutrients into the bloodstream for distribution throughout the body

Question 2

Which of the following is NOT considered an accessory organ of the digestive system?

Accepted Answer

Small intestine

Question 3

The peritoneum is the largest serous membrane in the body. Which of the following is a function of the peritoneum?

Accepted Answer

It provides a frictionless surface for abdominal organs to move against each other

Question 4

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

Accepted Answer

Muscularis externa

Question 5

A patient presents with difficulty swallowing (dysphagia). Which anatomical region is most likely involved in this process?

Accepted Answer

Pharynx

Question 6

Which of the following teeth are primarily responsible for tearing food?

Accepted Answer

Canines

Question 7

Which cell type in the gastric glands secretes hydrochloric acid ($$\mathrm{HCl}$$)?

Accepted Answer

Parietal cells

Question 8

During the cephalic phase of gastric secretion, which nerve is primarily responsible for stimulating gastric activity?

Accepted Answer

Vagus nerve

Question 9

Which of the following best describes the process of segmentation in the small intestine?

Accepted Answer

Mixing contractions of circular smooth muscle that churn chyme

Question 10

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

Accepted Answer

Emulsification and absorption of lipids in the small intestine

Question 11

Which hormone stimulates the gallbladder to contract and release bile into the small intestine?

Accepted Answer

Cholecystokinin (CCK)

Question 12

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

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 13

Which of the following best explains why the stomach has an additional oblique muscle layer in its muscularis externa?

Accepted Answer

To enhance the churning and mechanical breakdown of food

Question 14

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

Accepted Answer

Pernicious anemia

Question 15

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

Accepted Answer

It transports nutrient-rich blood from the digestive organs to the liver for processing

Question 16

Which enzyme is responsible for the initial chemical digestion of carbohydrates in the oral cavity?

Accepted Answer

Salivary amylase

Question 17

Which of the following statements about the large intestine is TRUE?

Accepted Answer

It absorbs water and electrolytes, forming feces

Question 18

A patient with a damaged myenteric plexus would most likely experience which of the following symptoms?

Accepted Answer

Impaired motility and peristalsis in the gastrointestinal tract

Question 19

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

Accepted Answer

They emulsify lipids, increasing the surface area for pancreatic lipase action

Question 20

Which process is primarily responsible for moving chyme through the small intestine?

Accepted Answer

Peristalsis

The Digestive System: Structure and Function

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