Class 11 Zoology simulations · Excretory Products and their Elimination

Nephron: filtration and reabsorption

Trace filtrate from the glomerulus through the tubule. Nearly all of it is reabsorbed.

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What to notice

About 99% of the filtrate is reabsorbed by the renal tubules; PCT reabsorbs most of the useful substances.

Key relation

GFR ≈ 125 mL/min ≈ 180 L/day ; urine ≈ 1–1.5 L/day

Try this

Lower the reabsorption to 98%. How much urine would that make per day?

What you can change

• Glomerular filtration rate: 60 to 150 mL/min
• Water reabsorbed: 97 to 99.6 %

More in Excretory Products and their Elimination

• ADH and water balance
• Counter-current mechanism

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