Question 1

Which of the following best describes the primary function of the small intestine?

Accepted Answer

Completion of chemical digestion and absorption of 90% of nutrients

Question 2

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

Accepted Answer

Circular muscle layer

Question 3

A patient has a blockage at the ileocecal valve. Which process would be most directly affected?

Accepted Answer

Passage of material from the ileum to the cecum

Question 4

Which phase of gastric regulation is primarily triggered by the sight, smell, taste, or thought of food?

Accepted Answer

Cephalic phase

Question 5

Which of the following is NOT a function of the liver?

Accepted Answer

Production of digestive enzymes for the small intestine

Question 6

A patient with a deficiency in pancreatic exocrine function would most likely experience which symptom?

Accepted Answer

Impaired absorption of nutrients due to lack of digestive enzymes

Question 7

Which layer of the digestive tract is responsible for peristaltic movement?

Accepted Answer

Muscular layer

Question 8

Which of the following best explains why water absorption in the digestive tract is a passive process?

Accepted Answer

Water moves down osmotic gradients created by solute absorption

Question 9

Which region of the stomach is primarily responsible for mixing ingested food with gastric secretions?

Accepted Answer

Body

Question 10

A patient with a damaged submucosal plexus would most likely have issues with which digestive process?

Accepted Answer

Secretion of digestive enzymes and buffers

Question 11

Which of the following is a function of the large intestine?

Accepted Answer

Absorption of water and compaction of feces

Question 12

Which vitamin is NOT produced by bacteria in the large intestine?

Accepted Answer

Vitamin B12

Question 13

If the pyloric sphincter fails to open, which of the following will occur?

Accepted Answer

Chyme will not enter the duodenum

Question 14

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

Accepted Answer

It emulsifies fats to promote absorption by intestinal epithelia

Question 15

A patient presents with jaundice and impaired fat digestion. Which organ is most likely malfunctioning?

Accepted Answer

Liver

Question 16

Which of the following is the correct sequence of the layers of the digestive tract from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscular layer, serosa

Question 17

Which of the following best explains why the stomach has an additional oblique muscle layer?

Accepted Answer

To enhance mechanical digestion by churning food

Question 18

Which hormone is released in response to the presence of lipids and carbohydrates in the duodenum and inhibits gastric activity?

Accepted Answer

Gastric inhibitory peptide (GIP)

Question 19

A patient with a resected jejunum would most likely experience which of the following?

Accepted Answer

Impaired chemical digestion and nutrient absorption

Question 20

Which of the following best describes the process of defecation?

Accepted Answer

Elimination of compacted, dehydrated wastes from the body

Lecture 10.1: The Digestive System

Study Guide - Practice Questions