Renal Filtration and Electrolyte Balance · USMLE Step 1

Which of the following would most likely decrease glomerular filtration rate (GFR)?

  1. Constriction of the efferent arteriole
  2. Dilation of the afferent arteriole
  3. Decrease in plasma oncotic (colloid) pressure
  4. Increase in Bowman's capsule hydrostatic pressure
Show answer and explanation

Correct answer: Increase in Bowman's capsule hydrostatic pressure

An increase in hydrostatic pressure within Bowman's capsule opposes filtration pressure, thereby reducing net filtration and decreasing GFR.

Difficulty: Medium Question 16 of 20

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