Of the roughly 180 litres of glomerular filtrate formed in a day, the amount normally excreted as urine is about

  • A. 180 litres
  • B. 90 litres
  • C. 18 litres
  • D. 1.5 litres

Explanation

Over 99 per cent of the filtrate is reabsorbed, leaving roughly a litre and a half of urine. This huge turnover shows how much work the tubules do in reclaiming water and solutes.

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