What is the least selective process during urine formation:
Correct answer: B. Pressure filtration
- A. Reabsorption
- B. Pressure filtration
- C. Secretion
- D. Differential permeability
Explanation
Pressure filtration at the renal corpuscle is the least selective since all molecules with a molecular mass below 69000 pass through the basement membrane and into the bowman's capsule as the filtrate.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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