Q: Which equation correctly represents the chemical digestion of proteins in the stomach?

$$\text{Protein} + \text{Pepsin} + \text{HCl} \rightarrow \text{Peptides}$$

Q: Which equation best represents the action of the gastric proton pump in parietal cells?

$$\text{H}^+ / \text{K}^+ \text{ATPase}: \text{H}^+_{\text{in}} + \text{K}^+_{\text{out}} \rightarrow \text{H}^+_{\text{out}} + \text{K}^+_{\text{in}}$$

Question 1

Which layer of the gastrointestinal (GI) tract contains the Meissner's plexus, and what is its primary function?

Accepted Answer

Submucosa; controls gland secretion and blood flow

Question 2

A patient presents with difficulty swallowing (dysphagia). Which muscle layer and nerve are most likely involved in this dysfunction?

Accepted Answer

Muscularis externa and vagus nerve (CN X)

Question 3

Which of the following best describes the enterohepatic circulation of bile salts?

Accepted Answer

Bile salts are absorbed in the ileum, returned to the liver via the portal vein, and reused

Question 4

Which equation correctly represents the chemical digestion of proteins in the stomach?

Accepted Answer

$$	ext{Protein} + 	ext{Pepsin} + 	ext{HCl} ightarrow 	ext{Peptides}$$

Question 5

A patient has a deficiency in secretin. Which physiological process would be most affected?

Accepted Answer

Neutralization of gastric acid in the duodenum

Question 6

Which of the following is a correct sequence of regions in the small intestine from proximal to distal?

Accepted Answer

Duodenum, Jejunum, Ileum

Question 7

Which cell type in the liver is primarily responsible for vitamin A storage?

Accepted Answer

Stellate cells

Question 8

A patient with a blocked pyloric sphincter would most likely experience which of the following symptoms?

Accepted Answer

Delayed gastric emptying and vomiting

Question 9

Which of the following best explains the role of the parasympathetic nervous system in salivary gland secretion?

Accepted Answer

It stimulates saliva production via CN VII and IX

Question 10

Which of the following is NOT a major function of the digestive system?

Accepted Answer

Production of red blood cells

Question 11

A patient with a deficiency in pancreatic bicarbonate secretion would most likely have problems with which process?

Accepted Answer

Neutralization of acidic chyme in the duodenum

Question 12

Which hormone stimulates the release of bile from the gallbladder?

Accepted Answer

Cholecystokinin (CCK)

Question 13

Which equation best represents the action of the gastric proton pump in parietal cells?

Accepted Answer

$$	ext{H}^+ / 	ext{K}^+ 	ext{ATPase}: 	ext{H}^+_{	ext{in}} + 	ext{K}^+_{	ext{out}} ightarrow 	ext{H}^+_{	ext{out}} + 	ext{K}^+_{	ext{in}}$$

Question 14

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

Accepted Answer

Water reabsorption and bacterial vitamin K synthesis

Question 15

A patient with liver dysfunction is unable to properly metabolize bilirubin. What clinical sign would most likely be observed?

Accepted Answer

Jaundice (yellowing of the skin and eyes)

Question 16

Which of the following best describes the function of the lower esophageal sphincter?

Accepted Answer

Prevents reflux of gastric contents into the esophagus

Question 17

Which of the following is a correct description of the muscularis externa in the GI tract?

Accepted Answer

Contains an inner circular and outer longitudinal muscle layer

Question 18

A patient with a loss of Brunner's glands in the duodenum would most likely have difficulty with which process?

Accepted Answer

Neutralizing acidic chyme entering from the stomach

Question 19

Which of the following best explains the role of CCK (cholecystokinin) in digestion?

Accepted Answer

Stimulates release of pancreatic enzymes and bile

Digestive System: Structure and Function Study Notes

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