Question 1

Which layer of the digestive tract is primarily responsible for absorption of nutrients and contains specialized structures such as villi and microvilli?

Accepted Answer

Mucosa

Question 2

During swallowing, which phase involves the movement of the bolus from the oral cavity into the pharynx, triggering the swallowing reflex?

Accepted Answer

Buccal phase

Question 3

Which of the following best describes peristalsis in the digestive tract?

Accepted Answer

Coordinated wave of muscular contraction that propels material through the tube

Question 4

Which cell type in the gastric gland is responsible for secreting hydrochloric acid ($$HCl$$)?

Accepted Answer

Parietal cells

Question 5

A patient with a deficiency in pancreatic alpha-amylase would have difficulty digesting which macromolecule?

Accepted Answer

Carbohydrates

Question 6

Which modification of the small intestine increases surface area for absorption the most?

Accepted Answer

Microvilli

Question 7

Which hormone stimulates the release of pancreatic juice rich in bicarbonate to neutralize acidic chyme entering the duodenum?

Accepted Answer

Secretin

Question 8

What is the primary function of bile produced by the liver?

Accepted Answer

Emulsification of fats

Question 9

Which process in the large intestine is responsible for the formation of feces and involves slow segmental contractions?

Accepted Answer

Haustral churning

Question 10

Which of the following best describes the absorption pathway of lipids from the lumen of the small intestine?

Accepted Answer

Into epithelial cells, then into lacteals (lymphatics)

Question 11

A patient presents with impaired segmentation in the small intestine. Which of the following is most likely to be affected?

Accepted Answer

Mixing and local breakdown of chyme

Question 12

Which brush border enzyme is responsible for activating trypsinogen to trypsin in the small intestine?

Accepted Answer

Enteropeptidase

Question 13

Which of the following is a function of the muscularis externa layer of the digestive tract?

Accepted Answer

Generation of peristaltic and segmentation movements

Question 14

Which phase of swallowing is under voluntary control?

Accepted Answer

Buccal phase

Question 15

If the gastroileal reflex is activated, what is the expected physiological outcome?

Accepted Answer

Opening of the ileocecal valve, allowing material to pass from the small to large intestine

Question 16

Which of the following best explains why the stomach can digest proteins but not carbohydrates efficiently?

Accepted Answer

The stomach secretes pepsin, which digests proteins, but lacks enzymes for carbohydrate digestion

Question 17

Which of the following is a correct sequence for the movement of a food bolus through the digestive tract?

Accepted Answer

Oral cavity → pharynx → esophagus → stomach → small intestine → large intestine

Question 18

Which of the following enzymes is secreted as an inactive proenzyme and activated in the small intestine?

Accepted Answer

Trypsinogen

Question 19

A patient with a blocked bile duct would most likely have difficulty digesting which type of nutrient?

Accepted Answer

Fats

Question 20

Which structure in the villi is responsible for the absorption of dietary fats?

Accepted Answer

Lacteal

Chapter 24: The Digestive System – Structure, Function, and Regulation

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