Physiology Renal autoregulation: A Is associated with increased renal vascular resistance when arterial blood pressure is lowered from 100 to 80 mm Hg B Mainly involves changes in the caliber of efferent arterioles C Maintains a normal renal blood flow during severe hypotension (blood pressure, 50 mm Hg) D Minimizes the impact of changes in arterial blood pressure on renal Na+ excretion 💡 Explanation Renal autoregulation: ✓ Correct Answer: D. Minimizes the impact of changes in arterial blood pressure on renal Na+ excretion