Question 1

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

Accepted Answer

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

Question 2

A patient presents with inflammation of the peritoneum after a ruptured appendix. What is the most immediate danger if the infection becomes widespread?

Accepted Answer

Peritonitis can become lethal due to systemic infection.

Question 3

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

Accepted Answer

Muscularis externa

Question 4

During digestion, which process involves local constriction of the intestine that mixes food with digestive juices?

Accepted Answer

Segmentation

Question 5

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

Accepted Answer

Stomach

Question 6

A patient with Sjögren’s syndrome is likely to experience which oral symptom due to reduced saliva production?

Accepted Answer

Xerostomia, leading to dry mouth and problems with chewing and swallowing

Question 7

Which of the following best explains the role of the hepatic portal circulation in digestion?

Accepted Answer

It drains nutrient-rich blood from digestive organs and delivers it to the liver for processing.

Question 8

Which histological layer of the alimentary canal contains blood vessels, lymphatics, and elastic tissue to help organs regain shape after a meal?

Accepted Answer

Submucosa

Question 9

Which nerve plexus in the enteric nervous system primarily controls GI tract motility?

Accepted Answer

Myenteric nerve plexus

Question 10

A patient is unable to close off the nasopharynx during swallowing, resulting in food entering the nasal cavity. Which structure is most likely malfunctioning?

Accepted Answer

Soft palate

Question 11

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

Accepted Answer

Filiform papillae

Question 12

Which process in the digestive system is defined as the passage of digested fragments from the lumen of the GI tract into blood or lymph?

Accepted Answer

Absorption

Question 13

Which of the following is a correct statement about the serosa layer of the alimentary canal?

Accepted Answer

It is the outermost layer, made up of the visceral peritoneum and areolar connective tissue.

Question 14

Which of the following best describes the effect of the parasympathetic nervous system on digestive activity?

Accepted Answer

It enhances digestive processes.

Question 15

A patient with impacted wisdom teeth is at risk for which of the following complications?

Accepted Answer

Increased pressure and pain in the jaw

Question 16

Which of the following equations correctly represents the dental formula for permanent human teeth?

Accepted Answer

$$2-1-2-3/2-1-2-3$$

Question 17

Which of the following is a function of the lamina propria in the mucosa layer of the alimentary canal?

Accepted Answer

Contains capillaries for nourishment and absorption

Question 18

Which of the following is a consequence of periodontitis that can increase risk for cardiovascular disease?

Accepted Answer

Promotion of atherosclerotic plaque formation due to bacteria entering the blood

Question 19

Which of the following best describes the role of short reflexes in the control of digestive activity?

Accepted Answer

They are mediated by enteric nerve plexuses and respond to stimuli within the GI tract.

Question 20

Which of the following is the correct sequence of the six essential digestive processes?

Accepted Answer

Ingestion, propulsion, mechanical breakdown, digestion, absorption, defecation

Chapter 23 Part A: The Digestive System – Structure, Function, and Regulation

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