Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 68 of 99
The initial ultrafiltration of blood plasma in human nephrons occurs specifically across which structural unit?
A
Proximal and distal convoluted tubules
B
Ascending and descending limbs of Henle
C
Glomerulus and Bowman's Capsule
D
Collecting duct
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Glomerulus and Bowman's Capsule
Concept: Anatomy of the renal corpuscle.

Solution: Ultrafiltration occurs across the renal corpuscle, which consists of the glomerulus (a high-pressure capillary network) and Bowman's Capsule (the surrounding epithelial cup that receives the filtrate).

Why other options are incorrect:
  • Option A & Option B: Convoluted tubules and loops of Henle perform selective reabsorption and secretion, not primary ultrafiltration.

  • Option D: Collecting ducts modify final urine concentration via water reabsorption.

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