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Gastrointestinal and Nutrition Physiology

GI tract disorders Practice Questions

40 free GI tract disorders practice questions for the Physiology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 40 Medium

Gastroesophageal reflux disease (GERD) is primarily caused by:

  1. A Chronically delayed gastric emptying
  2. B Weakness of esophageal sphincter
  3. C Increased secretion of hepatic bile
  4. D Reduced secretion of gastric acid

Correct answer: Weakness of esophageal sphincter

GERD results from incompetence of the lower esophageal sphincter. This allows acidic gastric contents to reflux into the esophagus.

Question 2 of 40 Medium

Peptic ulcer disease most commonly involves the:

  1. A Distal esophagus and pharynx
  2. B Stomach and duodenum
  3. C Jejunum
  4. D Ascending and descending colon

Correct answer: Stomach and duodenum

Peptic ulcers occur in areas exposed to gastric acid and pepsin. The stomach and duodenum are most frequently affected.

Question 3 of 40 Medium

Helicobacter pylori contributes to peptic ulcer disease by:

  1. A Increasing bicarbonate secretion
  2. B Reducing gastric acid production
  3. C Damaging mucosal defenses
  4. D Enhancing gastric emptying and motility

Correct answer: Damaging mucosal defenses

H. pylori disrupts the mucosal barrier and induces inflammation. This increases susceptibility to acid-mediated injury.

Question 4 of 40 Medium

Which condition is characterized by chronic inflammation limited to the colon?

  1. A Crohn disease
  2. B Ulcerative colitis
  3. C Celiac disease
  4. D Irritable bowel syndrome

Correct answer: Ulcerative colitis

Ulcerative colitis affects only the colon and rectum. The inflammation is continuous and mucosal in nature.

Question 5 of 40 Medium

Crohn disease differs from ulcerative colitis by:

  1. A Being strictly limited to the colon
  2. B Having continuous lesions
  3. C Involving transmural inflammation
  4. D Lacking immune involvement

Correct answer: Involving transmural inflammation

Crohn disease causes transmural inflammation and skip lesions. It can affect any part of the gastrointestinal tract.

Question 6 of 40 Medium

Celiac disease results from intolerance to:

  1. A Lactose
  2. B Gluten
  3. C Fructose
  4. D Sucrose

Correct answer: Gluten

Celiac disease is an immune-mediated reaction to gluten. This leads to villous atrophy and malabsorption.

Question 7 of 40 Medium

The primary physiological consequence of villous atrophy in celiac disease is:

  1. A Increased intestinal secretion
  2. B Impaired luminal digestion overall
  3. C Reduced absorptive surface area
  4. D Delayed gastric emptying

Correct answer: Reduced absorptive surface area

Villous atrophy reduces the intestinal surface area. This significantly impairs nutrient absorption.

Question 8 of 40 Medium

Irritable bowel syndrome (IBS) is best described as:

  1. A Structural bowel disease
  2. B Functional bowel disorder
  3. C Autoimmune inflammatory bowel disease
  4. D Chronic infectious enteritis

Correct answer: Functional bowel disorder

IBS is a functional disorder without identifiable structural abnormalities. Symptoms relate to altered motility and sensitivity.

Question 9 of 40 Medium

Diarrhea in cholera is mainly due to:

  1. A Reduced intestinal motility
  2. B Inhibition of sodium absorption
  3. C Increased chloride secretion
  4. D Mucosal inflammation

Correct answer: Increased chloride secretion

Cholera toxin stimulates chloride secretion via cAMP. Water follows osmotically, causing profuse watery diarrhea.

Question 10 of 40 Medium

Constipation is most commonly associated with:

  1. A Increased intestinal motility
  2. B Decreased water absorption
  3. C Reduced colonic motility
  4. D Enhanced secretory activity

Correct answer: Reduced colonic motility

Reduced colonic motility increases water absorption from feces. This leads to hard, infrequent stools.

Question 11 of 40 Medium

Achalasia is characterized by failure of:

  1. A Gastric peristalsis
  2. B Lower esophageal sphincter relaxation
  3. C Upper esophageal sphincter contraction
  4. D Intestinal segmentation

Correct answer: Lower esophageal sphincter relaxation

Achalasia involves impaired relaxation of the lower esophageal sphincter. This leads to difficulty in swallowing.

Question 12 of 40 Medium

Which GI disorder is most associated with malabsorption of fat-soluble vitamins?

  1. A Gastroesophageal reflux disease
  2. B Pancreatic insufficiency
  3. C Irritable bowel syndrome
  4. D Chronic atrophic gastritis

Correct answer: Pancreatic insufficiency

Pancreatic insufficiency reduces lipase secretion. This impairs fat digestion and absorption of fat-soluble vitamins.

Question 13 of 40 Medium

Jaundice in obstructive biliary disease occurs primarily due to:

  1. A Excess bilirubin production
  2. B Reduced hepatic uptake of bilirubin
  3. C Impaired bile flow into intestine
  4. D Increased hemolysis

Correct answer: Impaired bile flow into intestine

Obstruction prevents bile from reaching the intestine. Conjugated bilirubin accumulates in the blood.

Question 14 of 40 Medium

Dumping syndrome is most commonly seen after:

  1. A Cholecystectomy
  2. B Gastrectomy
  3. C Appendectomy
  4. D Colectomy

Correct answer: Gastrectomy

Gastrectomy allows rapid gastric emptying into the intestine. This causes fluid shifts and hypoglycemia.

Question 15 of 40 Medium

Which hormone is deficient in pernicious anemia due to gastric pathology?

  1. A Gastrin secreted by G cells
  2. B Intrinsic factor
  3. C Secretin
  4. D Cholecystokinin

Correct answer: Intrinsic factor

Loss of intrinsic factor impairs vitamin B12 absorption. This leads to pernicious anemia.

Question 16 of 40 Medium

Acute pancreatitis is most commonly caused by:

  1. A Acute viral infection of the pancreas
  2. B Alcohol abuse and gallstones
  3. C Bacterial toxins
  4. D Autoimmune injury

Correct answer: Alcohol abuse and gallstones

Alcohol and gallstones are the leading causes of acute pancreatitis. They trigger premature activation of pancreatic enzymes.

Question 17 of 40 Medium

Steatorrhea is best defined as:

  1. A Fresh or altered blood in stool
  2. B Excess fat in stool
  3. C Watery diarrhea
  4. D Mucus in stool

Correct answer: Excess fat in stool

Steatorrhea refers to increased fat excretion in feces. It indicates fat malabsorption.

Question 18 of 40 Medium

Which disorder results from lactose intolerance?

  1. A Secretory diarrhea
  2. B Osmotic diarrhea
  3. C Inflammatory diarrhea
  4. D Motility disorder

Correct answer: Osmotic diarrhea

Undigested lactose draws water into the intestine. This causes osmotic diarrhea.

Question 19 of 40 Medium

Portal hypertension commonly leads to development of:

  1. A Recurrent peptic ulcers
  2. B Esophageal varices
  3. C Internal and external hemorrhoids
  4. D Gallstones

Correct answer: Esophageal varices

Increased portal pressure diverts blood through collateral vessels. This results in esophageal varices.

Question 20 of 40 Medium

Which GI disorder is associated with chronic alcohol-induced liver damage?

  1. A Hepatic encephalopathy
  2. B Celiac disease
  3. C Irritable bowel syndrome
  4. D Gastroesophageal reflux

Correct answer: Hepatic encephalopathy

Chronic liver disease impairs detoxification of ammonia. This can lead to hepatic encephalopathy.

Question 21 of 40 Medium

Which of the following describes the pathophysiology of Achalasia?

  1. A Excessive relaxation of the upper esophageal sphincter during rest periods
  2. B Increased acid secretion by parietal cells
  3. C Hypertrophy of the pyloric sphincter
  4. D Failure of the lower esophageal sphincter to relax during swallowing

Correct answer: Failure of the lower esophageal sphincter to relax during swallowing

Achalasia is a motility disorder caused by the loss of inhibitory neurons in the myenteric plexus, leading to a failure of the LES to relax and impaired peristalsis.

Question 22 of 40 Medium

In Barrett's esophagus, which histological change occurs in response to chronic acid reflux?

  1. A Squamous cell hyperplasia
  2. B Progressive atrophy of the esophageal submucosal glands and mucosa
  3. C Keratinization of the mucosal layer
  4. D Metaplasia from stratified squamous to simple columnar epithelium

Correct answer: Metaplasia from stratified squamous to simple columnar epithelium

Chronic GERD can cause the normal squamous lining of the esophagus to be replaced by columnar intestinal-like epithelium, increasing the risk of adenocarcinoma.

Question 23 of 40 Medium

Which of the following is a primary physiological mechanism behind the secretory diarrhea caused by the Cholera toxin?

  1. A Permanent activation of adenylyl cyclase and increased cAMP
  2. B Inhibition of the Na+/K+ ATPase pump in intestinal enterocytes
  3. C Destruction of the intestinal villi
  4. D Osmotic draw due to undigested lactose

Correct answer: Permanent activation of adenylyl cyclase and increased cAMP

Cholera toxin keeps adenylyl cyclase active, leading to high cAMP levels that open CFTR chloride channels, causing massive secretion of water and electrolytes.

Question 24 of 40 Medium

Zollinger-Ellison syndrome is characterized by severe peptic ulcers due to a tumor secreting excess:

  1. A Secretin
  2. B CCK
  3. C Gastrin
  4. D Somatostatin

Correct answer: Gastrin

A gastrinoma (gastrin-secreting tumor) leads to hypergastrinemia, which causes massive overproduction of gastric acid by parietal cells.

Question 25 of 40 Medium

Pernicious anemia is a complication of chronic atrophic gastritis because the loss of parietal cells leads to a deficiency of:

  1. A Intrinsic factor
  2. B Pepsinogen
  3. C Gastric lipase
  4. D Hydrochloric acid

Correct answer: Intrinsic factor

Parietal cells secrete intrinsic factor, which is essential for the absorption of Vitamin B12 in the terminal ileum.

Question 26 of 40 Medium

What is the primary cause of the 'osmotic diarrhea' observed in individuals with lactose intolerance?

  1. A Significantly increased mucus secretion within the lining of the colon
  2. B Rapid gastric emptying
  3. C Undigested lactose drawing water into the intestinal lumen
  4. D Bacterial infection of the small intestine

Correct answer: Undigested lactose drawing water into the intestinal lumen

Lack of lactase leaves lactose undigested; its osmotic activity pulls water into the gut, and its fermentation by bacteria produces gas and organic acids.

Question 27 of 40 Medium

In the context of liver cirrhosis, 'Ascites' is primarily caused by which combination of factors?

  1. A Portal hypertension and hypoalbuminemia
  2. B Hypotension and hypernatremia
  3. C Increased bile production and jaundice
  4. D Decreased clotting factors and bruising

Correct answer: Portal hypertension and hypoalbuminemia

Portal hypertension increases hydrostatic pressure, while low albumin reduces plasma oncotic pressure, causing fluid to leak into the peritoneal cavity.

Question 28 of 40 Medium

Which characteristic specifically distinguishes Crohn's disease from Ulcerative Colitis?

  1. A It is limited only to the mucosal and submucosal layers of the colon
  2. B It always involves the rectum
  3. C It features 'skip lesions' and transmural inflammation
  4. D It is cured by surgical resection of the colon

Correct answer: It features 'skip lesions' and transmural inflammation

Crohn's disease can affect any part of the GI tract, involves all layers of the wall (transmural), and often has healthy tissue between inflamed areas (skip lesions).

Question 29 of 40 Medium

What is the physiological basis of 'Dumping Syndrome' following gastric bypass surgery?

  1. A Rapid entry of hypertonic chyme into the small intestine
  2. B Slowed gastric motility leading to chronic constipation and bloating
  3. C Excessive secretion of bile into the stomach
  4. D Deficiency of pancreatic amylase

Correct answer: Rapid entry of hypertonic chyme into the small intestine

Rapid emptying of high-osmolarity food into the jejunum causes fluid shifts from the blood into the gut, leading to hypotension and GI distress.

Question 30 of 40 Medium

Steatorrhea, or fatty stools, is a hallmark of exocrine pancreatic insufficiency because of a lack of:

  1. A Trypsin
  2. B Amylase
  3. C Bicarbonate
  4. D Lipases

Correct answer: Lipases

Pancreatic lipase is the primary enzyme for fat digestion; without it, dietary fats remain unabsorbed and are excreted in the stool.

Question 31 of 40 Medium

Helicobacter pylori promotes ulcer formation primarily by:

  1. A Producing urease to neutralize acid and damaging the protective mucus layer
  2. B Directly digesting the stomach muscle layer
  3. C Inhibiting the release of Gastrin
  4. D Increasing the thickness of the stomach's protective alkaline mucus tide layer

Correct answer: Producing urease to neutralize acid and damaging the protective mucus layer

H. pylori uses urease to survive the acid and triggers an inflammatory response that weakens the mucosal barrier, making it vulnerable to acid and pepsin.

Question 32 of 40 Medium

Which of the following is a common complication of portal hypertension resulting from liver disease?

  1. A Esophageal varices
  2. B Increased vitamin K absorption
  3. C Hyperglycemia
  4. D Decreased cardiac output

Correct answer: Esophageal varices

Increased pressure in the portal vein forces blood into collateral vessels, leading to dilated veins in the esophagus (varices) which are prone to rupture.

Question 33 of 40 Medium

In Celiac disease, the immune-mediated destruction of intestinal villi leads to which primary physiological defect?

  1. A Excessive secretion of stomach hydrochloric acid
  2. B Decreased surface area for nutrient absorption
  3. C Complete inability to swallow food (dysphagia)
  4. D Hypersecretion of insulin from the pancreas

Correct answer: Decreased surface area for nutrient absorption

Villous atrophy reduces the total surface area of the small intestine, leading to global malabsorption of macronutrients and vitamins.

Question 34 of 40 Medium

Hepatic encephalopathy in severe liver failure is largely attributed to the accumulation of which neurotoxic substance?

  1. A Urea
  2. B Ammonia
  3. C Bilirubin
  4. D Glucose

Correct answer: Ammonia

The failing liver cannot convert ammonia (from protein breakdown) into urea; ammonia crosses the blood-brain barrier and impairs neuronal function.

Question 35 of 40 Medium

Which condition is characterized by the presence of small, bulging pouches in the digestive tract wall that become inflamed or infected?

  1. A Gastritis
  2. B Diverticulitis
  3. C Appendicitis
  4. D Cholelithiasis

Correct answer: Diverticulitis

Diverticulitis occurs when diverticula (pouches) in the colon wall become inflamed, often causing pain and changes in bowel habits.

Question 36 of 40 Medium

Pre-hepatic jaundice is most likely caused by which of the following?

  1. A Gallstones in the common bile duct
  2. B Severe Hepatitis B infection of the liver
  3. C Excessive hemolysis of red blood cells
  4. D Pancreatic cancer

Correct answer: Excessive hemolysis of red blood cells

Pre-hepatic jaundice results from an overproduction of bilirubin (hemolysis) that exceeds the liver's capacity to conjugate and excrete it.

Question 37 of 40 Medium

What is the primary physiological trigger for the pain associated with Cholecystitis?

  1. A Excessive secretion of stomach hydrochloric acid
  2. B Gallbladder spasm against a blocked cystic duct
  3. C Auto-digestion of the liver by bile
  4. D Reflux of bile into the esophagus

Correct answer: Gallbladder spasm against a blocked cystic duct

Inflammation of the gallbladder (usually due to stones) causes pain when the gallbladder tries to contract (stimulated by CCK) against an obstruction.

Question 38 of 40 Medium

Hirschsprung disease results from a congenital absence of ganglion cells in which region of the distal colon wall?

  1. A Mucosal layer of the colon wall
  2. B Submucosal layer beneath the mucosa
  3. C Myenteric and submucosal plexuses
  4. D Serosal outer layer of the colon

Correct answer: Myenteric and submucosal plexuses

The absence of the enteric nervous system in a segment of the colon prevents relaxation and peristalsis, leading to functional obstruction and megacolon.

Question 39 of 40 Medium

Acute pancreatitis involves the premature activation of which enzyme within the pancreatic tissue itself?

  1. A Amylase
  2. B Trypsin
  3. C Lipase
  4. D Enterokinase

Correct answer: Trypsin

Pancreatitis is essentially a process of 'auto-digestion' where trypsinogen is converted to trypsin prematurely, which then activates other proteases that damage the gland.

Question 40 of 40 Medium

Which GI disorder is most likely to result in a deficiency of fat-soluble vitamins (A, D, E, and K)?

  1. A Gastroesophageal reflux disease
  2. B Biliary obstruction
  3. C Diverticulosis
  4. D Hemorrhoids

Correct answer: Biliary obstruction

Bile salts are necessary for the emulsification and absorption of fats and fat-soluble vitamins; obstruction prevents bile from entering the intestine.

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