A patient has elevated blood urea nitrogen (BUN) and serum creatinine levels. Which bowel preparation order would the nurse question for this patient who is scheduled for a renal arteriogram?

Correct Answer: A

Rationale: Fleet enemas are high in phosphate, risky with renal failure as it can't be excreted.

Correct Answer: C

Rationale: Afferent arteriole delivers blood directly into the glomerulus.

Correct Answer: A

Rationale: Vasa recta in medulla reaches high osmolarity for concentration.

Correct Answer: A

Rationale: Angiotensin II triggers aldosterone release from adrenal glands.

Correct Answer: C

Rationale: ANP reduces sodium reabsorption, increasing urine output.