A patient with an obstruction of the common bile duct has clay-colored fatty stools, among other manifestations. What is the pathophysiologic change that causes this clinical manifestation?

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: The correct answer is A: mouth. The mouth is not considered an accessory digestive structure because it is part of the main digestive system. The mouth is where the process of digestion begins with the mechanical breakdown of food through chewing and the chemical breakdown through the action of saliva produced by salivary glands. The salivary glands, pancreas, and liver are all accessory digestive structures because they aid in the digestion process but are not part of the alimentary canal. Salivary glands produce enzymes to further break down food, the pancreas secretes digestive enzymes and bicarbonate into the small intestine, and the liver produces bile to aid in the digestion and absorption of fats. These organs work alongside the main digestive system to help with the breakdown and absorption of nutrients.

Correct Answer: B

Rationale: The correct answer is B: iron. Iron is mainly absorbed in the duodenum, the first part of the small intestine. Here's the rationale: 1. Duodenum is where iron absorption begins. 2. Iron is absorbed through the duodenal mucosal cells. 3. The acidic environment in the duodenum enhances iron absorption. 4. Other nutrients like glucose are mainly absorbed in the small intestine but not specifically in the duodenum. 5. Sodium and water are primarily absorbed in the small intestine, with water being absorbed throughout the digestive tract.

Correct Answer: B

Rationale: The correct answer is B: Liver disorders. Rifampin and isoniazid are known to cause hepatotoxicity as a potential side effect. The combination of these two medications can lead to liver damage, making it crucial for the nurse to monitor liver function tests regularly. Gallstones (A), bleeding ulcers (C), and esophagitis (D) are not typically associated with rifampin and isoniazid therapy. Monitoring for liver disorders is essential due to the risk of hepatotoxicity with these medications.

Correct Answer: C

Rationale: The correct answer is C: formation and elimination of feces. The main function of the large intestine is to absorb water and electrolytes, form feces by compacting and storing waste material, and eliminate feces through defecation. This process helps maintain the body's fluid balance and eliminates waste. Choices A, B, and D are incorrect because absorption of nutrients primarily occurs in the small intestine, secretion of digestive enzymes mainly occurs in the stomach and small intestine, and digestion of proteins mainly occurs in the stomach and small intestine, not the large intestine.