Certified Gastroenterology RN GI Anatomy and Pathophysiology 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?

Accepted Answer

Parietal cells

Answer

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?

Accepted Answer

Autodigestion of pancreatic tissue by activated enzymes

Answer

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)?

Accepted Answer

Muscularis externa

Answer

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?

Accepted Answer

Celiac disease

Answer

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?

Accepted Answer

Stimulating gallbladder contraction and pancreatic enzyme release

Answer

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.

Certified Gastroenterology RN Practice Test

Certified Gastroenterology RN Practice Test

Certified Gastroenterology RN GI Anatomy and Pathophysiology Questions and Answers