Question 1

Which of the following best describes the role of the Chemoreceptor Trigger Zone (CTZ) in vomiting?

Accepted Answer

It detects toxins and drugs in the blood and cerebrospinal fluid, activating the vomiting reflex.

Question 2

A patient presents with difficulty swallowing, regurgitation of undigested food, coughing at night, and halitosis. What is the most likely diagnosis?

Accepted Answer

Esophageal diverticulum

Question 3

Which of the following is a protective function of insoluble gastric mucus?

Accepted Answer

It forms a thin, stable gel layer that protects against pepsin.

Question 4

A patient with chronic use of NSAIDs develops epigastric pain and is found to have a gastric ulcer. Which mechanism best explains the ulcer formation?

Accepted Answer

NSAIDs block prostaglandins, reducing mucosal protection.

Question 5

Which diagnostic test for Helicobacter pylori infection involves the detection of urease activity in a tissue sample?

Accepted Answer

Endoscopic biopsy

Question 6

A patient with gastroesophageal reflux disease (GERD) is advised to avoid large meals and alcohol. What is the physiological basis for these recommendations?

Accepted Answer

Large meals and alcohol decrease lower esophageal sphincter pressure, promoting acid reflux.

Question 7

Which of the following is a major complication of esophageal diverticulum?

Accepted Answer

Perforation pneumonia

Question 8

A patient with progressive dysphagia, weight loss, and chronic cough is most likely suffering from which condition?

Accepted Answer

Esophageal cancer

Question 9

Which of the following equations best represents the balance maintained by gastric mucosal transport systems?

Accepted Answer

$$H^+ + $$HCO_3$$^- \rightarrow H_2CO_3$$

Question 10

Which of the following is a risk factor for the development of stress ulcers?

Accepted Answer

Severe burns covering a large surface area

Question 11

A patient with celiac disease presents with diarrhea, weight loss, and anemia. What is the underlying pathophysiology?

Accepted Answer

Immune-mediated damage to small intestinal villi due to gluten exposure

Question 12

Which of the following is a common cause of large-volume osmotic diarrhea?

Accepted Answer

Lactose intolerance

Question 13

A patient develops severe diarrhea after antibiotic therapy. Which organism is most likely responsible?

Accepted Answer

Clostridium difficile

Question 14

Which of the following is a characteristic symptom of irritable bowel syndrome (IBS)?

Accepted Answer

Persistent abdominal pain with changes in bowel habits

Question 15

Which of the following is a complication of peptic ulcer disease that may require surgical intervention?

Accepted Answer

Perforation of the duodenal wall

Question 16

A patient with diverticulitis is at risk for which of the following complications?

Accepted Answer

Peritonitis due to perforation

Question 17

Which of the following best explains the rapid spread of infection in the peritoneal cavity?

Accepted Answer

The peritoneal cavity absorbs toxins quickly, allowing contaminants to move throughout the abdomen.

Question 18

Which of the following is a diagnostic method for colorectal cancer that involves direct visualization of the colon?

Accepted Answer

Flexible sigmoidoscopy

Question 19

A patient with mechanical intestinal obstruction is most likely to present with which of the following symptoms?

Accepted Answer

Abdominal distention due to swelling from trapped gas and fluids

Question 20

Which of the following best describes the pathophysiology of appendicitis?

Accepted Answer

Blockage of the appendix by fecalith, gallstones, or tumors leads to inflammation and possible perforation.

37 Patho

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