Question 1

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

Accepted Answer

Chemical digestion and nutrient absorption

Question 2

The mucosal layer of the small intestine is folded into structures called villi. What is the main advantage of these villi?

Accepted Answer

They increase surface area for absorption

Question 3

Which region of the small intestine receives secretions from the liver, gall bladder, and pancreas?

Accepted Answer

Duodenum

Question 4

Which cell type in the small intestine is responsible for secreting mucus?

Accepted Answer

Goblet cells

Question 5

Segmentation in the small intestine is best described as:

Accepted Answer

Circular smooth muscle contractions that mix chyme and increase contact with mucosa

Question 6

Which of the following is NOT a subdivision of the large intestine?

Accepted Answer

Duodenum

Question 7

The muscularis layer of the large intestine contains longitudinal muscle arranged into bands called:

Accepted Answer

Taeniae coli

Question 8

Which process in the large intestine is responsible for mixing and propelling contents, and occurs 3-4 times per day?

Accepted Answer

Mass movements (peristalsis)

Question 9

The defecation reflex is initiated by:

Accepted Answer

Stretch receptors in the sigmoid colon

Question 10

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

Accepted Answer

Produces bile to emulsify fats

Question 11

Which enzyme produced by the pancreas is responsible for starch digestion?

Accepted Answer

Pancreatic amylase

Question 12

A patient has a blockage in the common bile duct. Which digestive process would be most affected?

Accepted Answer

Emulsification and digestion of fats in the small intestine

Question 13

Which of the following nutrients is absorbed into lacteals rather than directly into blood capillaries?

Accepted Answer

Chylomicrons (formed from triglycerides)

Question 14

Which formula correctly represents the breakdown of a triglyceride during digestion?

Accepted Answer

$$\mathrm{Triglyceride} \rightarrow 3\ \mathrm{Fatty\ acids} + 1\ \mathrm{Glycerol}$$

Question 15

Which of the following is a correct sequence for the passage of food through the regions of the small intestine?

Accepted Answer

Duodenum → Jejunum → Ileum

Question 16

A patient with damage to the enterocytes in the small intestine would most likely experience problems with:

Accepted Answer

Absorption of nutrients

Question 17

Which structure is responsible for storing and releasing excess bile produced by the liver?

Accepted Answer

Gall bladder

Question 18

Which of the following best explains why the large intestine does not have villi or circular folds?

Accepted Answer

It does not participate in nutrient absorption to the same extent as the small intestine

Question 19

Which of the following is a function of the colon that distinguishes it from the small intestine?

Accepted Answer

Complete absorption of water and formation of feces

Question 20

Which of the following best describes the role of brush border enzymes in the small intestine?

Accepted Answer

They complete digestion at the apical surface of enterocytes

Digestive System Part 2: Small Intestine, Large Intestine, and Accessory Organs

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