1. Multiple Choice: A patient with chronic kidney disease is at risk for which electrolyte imbalance? a) Hyperkalemia b) Hypokalemia c) Hyponatremia d) Hypercalcemia Correct Answer: a) Hyperkalemia Rationale: Patients with chronic kidney disease often have diminished renal function, leading to decreased excretion of potassium, which can cause hyperkalemia. 2. Fill-in-the-Blank: The primary hormone regulating serum calcium levels is __________. Correct Answer: Parathyroid hormone Rationale: Parathyroid hormone (PTH) increases serum calcium levels by stimulating the release of calcium from bones, increasing calcium absorption in the intestines, and decreasing calcium excretion in the kidneys.