Certified Gastroenterology RN GI Anatomy and Pathophysiology Questions and Answers — Questions and Answers
Question 1: A patient with a history of chronic gastritis is undergoing an endoscopy. The nurse knows that chronic inflammation of the stomach lining leads to the atrophy of which cells, resulting in pernicious anemia?
- Chief cells
- Parietal cells (Correct answer)
- G cells
- Mucous neck cells
Correct answer: Parietal cells
Parietal cells, located in the gastric glands of the stomach, are responsible for secreting hydrochloric acid and intrinsic factor. Intrinsic factor is essential for the absorption of vitamin B12 in the ileum. Chronic gastritis can lead to the destruction of parietal cells, causing a deficiency in intrinsic factor, which in turn leads to inadequate vitamin B12 absorption and the development of pernicious anemia.
Question 2: A nurse is caring for a patient admitted with acute pancreatitis. The patient complains of severe, boring epigastric pain that radiates to the back. Which pathophysiological process is the primary cause of this intense pain?
- Obstruction of the common bile duct by a gallstone
- Reflux of gastric acid into the pancreatic duct
- Autodigestion of pancreatic tissue by activated enzymes (Correct answer)
- Inflammation and swelling of the hepatic capsule
Correct answer: Autodigestion of pancreatic tissue by activated enzymes
Acute pancreatitis is characterized by the premature activation of pancreatic enzymes, such as trypsinogen to trypsin, within the pancreas itself. These activated enzymes begin to digest the pancreatic tissue and surrounding fats (autodigestion), leading to inflammation, edema, hemorrhage, and intense pain.
Question 3: Which of the following layers of the gastrointestinal wall is responsible for peristalsis and contains the myenteric plexus (Auerbach's plexus)?
- Mucosa
- Submucosa
- Serosa
- Muscularis externa (Correct answer)
Correct answer: Muscularis externa
The muscularis externa, typically consisting of an inner circular and an outer longitudinal layer of smooth muscle, is responsible for the coordinated contractions that produce peristalsis. Between these two muscle layers lies the myenteric plexus (Auerbach's plexus), which is the major nerve supply to the GI tract and controls GI tract motility.
Question 4: A patient presents with steatorrhea (fatty stools), weight loss, and vitamin deficiencies. An intestinal biopsy reveals blunting of the villi in the duodenum. This finding is most characteristic of which GI disorder?
- Ulcerative colitis
- Celiac disease (Correct answer)
- Crohn's disease
- Diverticulitis
Correct answer: Celiac disease
Celiac disease is an autoimmune disorder triggered by the ingestion of gluten in genetically susceptible individuals. The inflammatory response to gluten primarily affects the small intestine, leading to damage and atrophy (blunting) of the villi. This significantly reduces the surface area available for nutrient absorption, resulting in malabsorption of fats, vitamins, and other nutrients.
Question 5: The hormone cholecystokinin (CCK) plays a crucial role in digestion. Which of the following is a primary action of CCK?
- Stimulating gastric acid secretion
- Inhibiting all pancreatic secretions
- Stimulating gallbladder contraction and pancreatic enzyme release (Correct answer)
- Increasing the rate of gastric emptying
Correct answer: Stimulating gallbladder contraction and pancreatic enzyme release
Cholecystokinin (CCK) is secreted by enteroendocrine cells in the duodenum in response to the presence of fats and proteins. Its main functions are to stimulate the contraction of the gallbladder to release bile and to stimulate the pancreas to secrete digestive enzymes, both of which are essential for the digestion of fats and proteins.
Question 6: A patient with gastroesophageal reflux disease (GERD) is advised to avoid certain foods and lifestyle habits. The underlying pathophysiology of GERD involves the dysfunction of which anatomical structure?
- Pyloric sphincter
- Upper esophageal sphincter
- Diaphragmatic cruise
- Lower esophageal sphincter (LES) (Correct answer)
Correct answer: Lower esophageal sphincter (LES)
GERD is primarily caused by the inappropriate or transient relaxation of the lower esophageal sphincter (LES). The LES is a ring of muscle at the junction of the esophagus and stomach that normally prevents the backflow of acidic stomach contents into the esophagus. When the LES is weak or relaxes improperly, reflux occurs, leading to symptoms like heartburn and potential esophageal mucosal injury.
Certified Gastroenterology RN GI Anatomy and Pathophysiology Questions and Answers
A patient with a history of chronic gastritis is undergoing an endoscopy.
The nurse knows that chronic inflammation of the stomach lining leads to the atrophy of which cells, resulting in pernicious anemia?