Renal Filtration and Electrolyte Balance · USMLE Step 1

Which function is NOT primarily a role of the kidneys in renal physiology and electrolyte balance?

  1. Regulation of plasma osmolarity and volume
  2. Excretion of metabolic waste and toxins
  3. Generation of red blood cells directly
  4. Maintenance of acid–base and electrolyte homeostasis
Show answer and explanation

Correct answer: Generation of red blood cells directly

While the kidneys produce erythropoietin (which stimulates red blood cell production), they do not generate red blood cells themselves; that occurs in the bone marrow. The kidneys’ primary roles include filtration, excretion, fluid/electrolyte balance, acid–base regulation, and volume control.

Difficulty: Medium Question 18 of 20

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