A nurse is caring for a patient with a leg ulcer. Which of the following interventions is most appropriate to promote healing of the ulcer?

Correct Answer: B

Rationale: The correct answer is B because elevating the affected leg helps improve blood circulation, reduce swelling, and promote healing of the ulcer. Applying a pressure bandage also helps with compression therapy, which aids in managing wound drainage and preventing infection. A: Applying a dry dressing may not provide enough moisture for proper wound healing. C: Using a hydrocolloid dressing can promote moisture retention but avoiding movement of the leg may hinder circulation and delay healing. D: Administering antibiotics is important if there is an infection present, but it does not directly promote healing of the ulcer.

Correct Answer: A

Rationale: The correct answer is A: secretin. Secretin is a hormone produced by the small intestine in response to acidic chyme entering the duodenum. It stimulates the release of pancreatic juice from the pancreas, which helps neutralize the acidic chyme. Summary: B: Gastrin stimulates gastric acid secretion in the stomach. C: Cholecystokinin stimulates the release of bile from the gallbladder and pancreatic enzymes. D: Insulin regulates blood sugar levels by facilitating the uptake of glucose into cells.

Correct Answer: C

Rationale: The correct answer is C: pepsin. Pepsin is an enzyme produced in the stomach that specifically breaks down proteins into peptides. Amylase (A) digests carbohydrates, lipase (B) digests fats, and sucrase (D) digests sucrose. Pepsin is the only enzyme among the choices that is responsible for digesting proteins, making it the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Small intestine. The small intestine is where most of the absorption of nutrients occurs due to its large surface area and presence of villi and microvilli. These structures increase the absorption capacity, allowing for efficient absorption of nutrients like carbohydrates, proteins, fats, vitamins, and minerals. The stomach primarily functions in the digestion of food through the action of stomach acid and enzymes, while the large intestine mainly absorbs water and electrolytes. The mouth is responsible for initial digestion through chewing and production of saliva but does not play a significant role in nutrient absorption.

Correct Answer: D

Rationale: The correct answer is D, Vitamin B12. The jejunum is not the main site for absorption of Vitamin B12; instead, it is absorbed in the terminal ileum. Glucose, amino acids, and fatty acids are primarily absorbed in the jejunum. Absorption of Vitamin B12 occurs in the ileum where it binds to intrinsic factor secreted by the stomach. Therefore, the jejunum is not the main site for absorption of Vitamin B12, making it the correct answer. Choices A, B, and C are incorrect because the jejunum is indeed the main site for absorption of glucose, amino acids, and fatty acids, respectively.