Q: Which of the following is the correct formula for the conversion of pepsinogen to pepsin in the stomach?

$$\text{Pepsinogen} + \text{HCl} \rightarrow \text{Pepsin}$$

Question 1

Which layer of the GI tract wall is primarily responsible for absorption and secretion, and contains epithelial cells in direct contact with the lumen?

Accepted Answer

Mucosa

Question 2

A patient has difficulty swallowing due to impaired peristalsis in the esophagus. Which layer of the GI tract is most likely affected?

Accepted Answer

Muscularis

Question 3

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

Accepted Answer

Small intestine

Question 4

During chemical digestion, which enzyme is responsible for breaking down carbohydrates in the mouth?

Accepted Answer

Salivary amylase

Question 5

Which structure prevents the backflow of stomach contents into the esophagus?

Accepted Answer

Lower esophageal/cardiac sphincter

Question 6

The greater omentum is best described as:

Accepted Answer

A double layer of serosa that attaches the greater curvature of the stomach and transverse colon, and contains adipose tissue and immune cells

Question 7

Which of the following is the correct sequence for the passage of food through the GI tract?

Accepted Answer

Mouth → Esophagus → Stomach → Small intestine → Large intestine → Rectum → Anus

Question 8

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

Accepted Answer

Bile emulsifies fats, increasing their surface area for enzyme action

Question 9

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

Accepted Answer

Emulsification and digestion of fats

Question 10

Which part of the small intestine receives acidic chyme from the stomach and secretions from the liver, gallbladder, and pancreas?

Accepted Answer

Duodenum

Question 11

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

Accepted Answer

Fermentation of remaining carbohydrates by bacteria

Question 12

Which layer of the GI tract wall contains blood vessels, lymphatics, and neurons of the enteric nervous system?

Accepted Answer

Submucosa

Question 13

A patient is unable to absorb vitamin B12 due to a lack of intrinsic factor. Which cell type in the stomach is most likely malfunctioning?

Accepted Answer

Parietal cell

Question 14

Which of the following is the correct formula for the conversion of pepsinogen to pepsin in the stomach?

Accepted Answer

$$	ext{Pepsinogen} + 	ext{HCl} ightarrow 	ext{Pepsin}$$

Question 15

Which of the following best describes the role of the hepatic portal system?

Accepted Answer

It drains nutrient-rich blood from the GI tract to the liver for processing

Question 16

Which of the following is a correct description of mechanical digestion?

Accepted Answer

Physical breakdown of food into smaller pieces, such as chewing and churning

Question 17

Which of the following is the correct order of layers from the lumen outward in the GI tract?

Accepted Answer

Mucosa → Submucosa → Muscularis → Serosa/adventitia

Question 18

A patient has a disease that destroys the microvilli in the small intestine. Which process will be most impaired?

Accepted Answer

Absorption of nutrients

Question 19

Which of the following is a function of the pancreas in digestion?

Accepted Answer

Production of digestive enzymes and bicarbonate

Question 20

Which equation best represents the breakdown of a triglyceride during digestion?

Accepted Answer

$$	ext{Triglyceride} \xrightarrow{	ext{Lipase}} 	ext{Fatty acids} + 	ext{Glycerol}$$

Digestive System: Structure and Function (ANAT 100 Study Notes)

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