Question 1

Which of the following is considered an accessory organ of the digestive system, and why?

Accepted Answer

Pancreas, because it connects to the GI tract via ducts but is not part of the alimentary canal.

Question 2

During embryonic development, all digestive organs are initially located in which anatomical compartment?

Accepted Answer

Intraperitoneal cavity

Question 3

Which mesentery attaches the liver to the anterior abdominal wall?

Accepted Answer

Falciform ligament

Question 4

A patient has a tumor compressing the lesser omentum. Which structures are most likely affected?

Accepted Answer

Liver, lesser curvature of the stomach, and duodenum

Question 5

Which of the following best describes the function of the mesenteries?

Accepted Answer

They store fat, provide a route for vessels, and hold organs in place.

Question 6

Which layer of the GI tract is responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 7

If an organ loses its mesentery during development, it becomes:

Accepted Answer

Secondarily retroperitoneal

Question 8

Which of the following is NOT a major function of the GI tract?

Accepted Answer

Filtration

Question 9

A surgeon is operating on the sigmoid colon. Which mesentery must be manipulated to access this organ?

Accepted Answer

Sigmoid mesocolon

Question 10

Which of the following best describes the difference between adventitia and serosa?

Accepted Answer

Serosa is present when the organ is covered by peritoneum; adventitia is present when it is in contact with another organ.

Question 11

Which of the following organs is secondarily retroperitoneal in the adult?

Accepted Answer

Pancreas

Question 12

A patient with a perforated duodenum is at risk for infection spreading to which anatomical space?

Accepted Answer

Peritoneal cavity

Question 13

Which of the following best describes the path of a nutrient molecule from the lumen of the small intestine to the blood?

Accepted Answer

Lumen → mucosa → submucosa → blood vessel

Question 14

Which of the following is a correct sequence of tissue layers from the lumen outward in the GI tract?

Accepted Answer

Mucosa → submucosa → muscularis externa → serosa

Question 15

Which of the following best explains why the kidneys are considered retroperitoneal?

Accepted Answer

They are located outside the peritoneal cavity and lost their mesenteries during development.

Question 16

Which of the following is a function of the submucosal layer of the GI tract?

Accepted Answer

Provides connective and nervous tissue support

Question 17

A patient with a damaged myenteric nerve plexus would most likely experience problems with which GI function?

Accepted Answer

Motility and peristalsis

Question 18

Which of the following best describes the role of the greater omentum?

Accepted Answer

Connects the greater curvature of the stomach to the posterior abdominal wall and stores fat

Question 19

Which of the following is the correct formula for calculating the length of the relaxed GI tract if the average adult GI tract is approximately 9 meters long?

Accepted Answer

$$L = 9\ 	ext{m}$$

Question 20

Which of the following best describes the function of the muscularis mucosa within the mucosal layer?

Accepted Answer

It produces local movements of the mucosa to enhance absorption and secretion.

The Digestive System: Structure, Function, and Organization

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