Question 1

Which of the following best describes the function of the alimentary canal in the digestive system?

Accepted Answer

It is a continuous muscular tube that digests and absorbs food fragments.

Question 2

A patient presents with severe abdominal pain after a ruptured appendix. Which of the following best explains the danger of this condition?

Accepted Answer

The peritoneal coverings stick together, localizing infection, but widespread infection can be lethal.

Question 3

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

Accepted Answer

Muscularis externa

Question 4

During swallowing, which structure prevents food from entering the nasopharynx?

Accepted Answer

Soft palate

Question 5

Which of the following is a function of the serosa layer of the alimentary canal?

Accepted Answer

Forms the outermost protective layer and is made of visceral peritoneum

Question 6

A patient with Sjögren’s syndrome is likely to experience which of the following symptoms due to its effect on the salivary glands?

Accepted Answer

Dry mouth (xerostomia)

Question 7

Which of the following statements about the enteric nervous system is correct?

Accepted Answer

It controls motility and glandular secretion in the GI tract.

Question 8

Which of the following best describes the difference between peristalsis and segmentation?

Accepted Answer

Peristalsis involves alternating waves of contraction and relaxation to move food, while segmentation mixes food by local constriction.

Question 9

Which of the following is NOT a function of saliva?

Accepted Answer

Absorbs nutrients into the bloodstream

Question 10

A patient has a toothache and X-rays reveal a cavity that has reached the pulp cavity. Which tissue is directly affected by this condition?

Accepted Answer

Pulp (connective tissue, blood vessels, and nerves)

Question 11

Which of the following best explains why the esophagus is covered by adventitia rather than serosa?

Accepted Answer

It is retroperitoneal and needs to be anchored to surrounding structures.

Question 12

Which of the following is a correct dental formula for permanent teeth in one half of the mouth?

Accepted Answer

$$2I, 1C, 2PM, 3M$$

Question 13

Which of the following papillae on the tongue does NOT contain taste buds?

Accepted Answer

Filiform papillae

Question 14

A patient with periodontitis is at increased risk for which of the following systemic conditions?

Accepted Answer

Atherosclerotic plaque formation and stroke

Question 15

Which of the following best describes the role of the mesentery in the digestive system?

Accepted Answer

It provides routes for blood vessels, lymphatics, and nerves, and holds organs in place.

Question 16

Which of the following statements about the control of digestive activity is correct?

Accepted Answer

Hormones from the stomach and small intestine can stimulate or inhibit digestive organs.

Question 17

Which of the following is a correct sequence of the layers of the alimentary canal from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 18

A patient is unable to move their tongue properly and has difficulty speaking. Examination reveals a very short lingual frenulum. What is the most likely diagnosis?

Accepted Answer

Ankyloglossia

Question 19

Which of the following best describes the function of the submucosal nerve plexus?

Accepted Answer

It regulates glands and smooth muscle in the mucosa.

Question 20

Which of the following is a real-life consequence of neglecting to treat gingivitis?

Accepted Answer

It can escalate to periodontitis, leading to destruction of the periodontal ligament and possible tooth loss.

Digestive System: Structure, Function, and Regulation

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