The nurse is caring for a patient who complains, "I don't see why I can't have a CT scan instead of the expensive MRI!" Which response is most appropriate for the nurse to make?

Correct Answer: A

Rationale: The correct answer is A because MRI provides better contrast between normal and pathologic tissue compared to CT scans. This allows for more accurate diagnosis and treatment planning. Choice B is incorrect because MRI images are typically more complex and require specialized analysis. Choice C is incorrect because both CT and MRI images can be transmitted digitally. Choice D is incorrect because CT scans actually expose patients to less radiation compared to MRI.

Correct Answer: C

Rationale: The correct answer is C. This statement indicates a need for further teaching because stopping digoxin abruptly can be dangerous. Digoxin should not be discontinued without consulting a healthcare provider. A: Monitoring pulse rate is important as digoxin can affect heart rate. B: Consistency in timing helps maintain consistent drug levels. D: Monitoring weight is crucial as digoxin can cause fluid retention. Therefore, choice C is incorrect as it suggests a potentially harmful action.

Correct Answer: C

Rationale: The correct answer is C: pancreas. The pancreas secretes most digestive enzymes, including amylase, lipase, and proteases, into the small intestine to aid in the digestion of carbohydrates, fats, and proteins. It plays a crucial role in breaking down food components. The stomach (choice A) secretes gastric juices but not the majority of digestive enzymes. The liver (choice B) produces bile, which aids in fat digestion, but does not secrete digestive enzymes. The small intestine (choice D) is where most digestion and absorption occur, but it does not secrete the majority of digestive enzymes.

Correct Answer: B

Rationale: The correct answer is B: chief cells. Chief cells are responsible for secreting pepsinogen in the stomach. Pepsinogen is an inactive form of pepsin, which is an enzyme that helps in protein digestion. Parietal cells secrete hydrochloric acid, not pepsinogen. Mucous neck cells secrete mucus to protect the stomach lining. Enteroendocrine cells secrete hormones like gastrin, but not pepsinogen. Therefore, the correct answer is B as chief cells are the specific cells that secrete pepsinogen in the stomach.

Correct Answer: B

Rationale: The correct answer is B: mechanical digestion. Teeth play a crucial role in breaking down food into smaller pieces through physical chewing, which is a form of mechanical digestion. This process increases the surface area of food particles, making it easier for enzymes to further break down nutrients during chemical digestion in the stomach and intestines. Choice A (chemical digestion) is incorrect because teeth do not directly participate in chemical breakdown of food. Choice C (enzymatic digestion) is incorrect as enzymes are not produced by teeth but by salivary glands and other digestive organs. Choice D (absorption) is incorrect as teeth are not involved in absorbing nutrients; absorption primarily occurs in the small intestine.