Question 1

Which layer of the digestive tract is responsible for the secretion of digestive enzymes and absorption of nutrients, and what is its main structural feature?

Accepted Answer

Mucosa; contains mucosal epithelium and villi

Question 2

During peristalsis, which muscle layer contracts behind the bolus to propel it forward?

Accepted Answer

Circular muscle layer

Question 3

A patient with a deficiency in intrinsic factor is likely to develop which condition, and why?

Accepted Answer

Pernicious anemia, because intrinsic factor is required for vitamin B12 absorption

Question 4

Which hormone is released when chyme enters the duodenum and stimulates the release of bile and pancreatic enzymes?

Accepted Answer

Cholecystokinin (CCK)

Question 5

What is the primary function of the large intestine?

Accepted Answer

Dehydration and compaction of indigestible materials

Question 6

Which structure in the small intestine increases surface area for absorption and contains a lacteal for fat transport?

Accepted Answer

Villi

Question 7

If a patient has a blockage in the common hepatic duct, which digestive process will be most affected?

Accepted Answer

Emulsification of lipids

Question 8

Which enzyme is responsible for the initial breakdown of starches in the oral cavity?

Accepted Answer

Salivary amylase

Question 9

What is the main function of the myenteric plexus in the digestive tract?

Accepted Answer

Coordination of smooth muscle contractions for motility

Question 10

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

Accepted Answer

Cycles of contraction that churn and fragment the bolus, mixing it with secretions

Question 11

Which equation best represents the formation of hydrochloric acid (HCl) in the parietal cells of the stomach?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightarrow H_2CO_3 \rightarrow $$HCO_3$$^- + H^+}$$

Question 12

A patient with damage to the submucosal neural plexus would most likely experience problems with which digestive function?

Accepted Answer

Secretion of buffers and enzymes

Question 13

Which of the following is NOT a function of saliva?

Accepted Answer

Absorbing nutrients directly into the bloodstream

Question 14

Which hormone is secreted in response to fats and carbohydrates entering the small intestine and stimulates insulin release?

Accepted Answer

Gastric inhibitory peptide (GIP)

Question 15

Which of the following best explains why nutrients are not absorbed in the stomach?

Accepted Answer

The stomach lacks villi and has a thick mucus layer

Question 16

Which structure is responsible for preventing food from entering the pharynx too soon during swallowing?

Accepted Answer

Uvula

Question 17

Which process is primarily responsible for the movement of water across the digestive tract?

Accepted Answer

Passive flow down osmotic gradients

Question 18

Which of the following is a major function of the liver related to digestion?

Accepted Answer

Secretion of bile for lipid digestion

Question 19

Which cell type in the small intestine is responsible for producing antimicrobial peptides as part of innate immunity?

Accepted Answer

Paneth cells

Question 20

Which of the following best describes the role of the gastroileal reflex?

Accepted Answer

Triggers the opening of the ileocecal valve, allowing materials to pass into the large intestine

The Digestive System: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards