Renal Filtration and Electrolyte Balance · USMLE Step 1

Which statement best describes the importance of hormonal control (e.g., ADH, aldosterone) over simple filtration in maintaining long-term electrolyte and fluid homeostasis?

  1. Filtration alone suffices for electrolyte balance regardless of intake
  2. Hormones adjust tubular reabsorption and secretion per diet and volume
  3. Hormones influence balance only during renal failure
  4. Hormonal effects only alter glomerular filtration rate
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Correct answer: Hormones adjust tubular reabsorption and secretion per diet and volume

While filtration constantly produces a large filtrate, hormonal regulation adjusts reabsorption and secretion in the tubules based on volume, electrolyte intake and physiologic needs, thus maintaining homeostasis more precisely.

Difficulty: Medium Question 19 of 20

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