Simulation · Biology · Class 11
A day of filtrate, balanced
From the lesson Reabsorption and secretion in Excretory Products and their Elimination. Change the values and watch what happens.
The idea behind it
NCERT §16.2
- About 180 litres of filtrate are formed a day but only about 1.5 litres of urine are passed, so nearly 99 per cent of the filtrate must be taken back by the renal tubules. This is reabsorption.
- The epithelial cells of the different tubule segments reabsorb by active or passive mechanisms.
- Glucose, amino acids, Na⁺ and similar substances are reabsorbed actively; nitrogenous wastes are absorbed passively.
- In the initial segments of the nephron, water is also reabsorbed passively.
- In secretion, tubular cells add substances such as H⁺, K⁺ and ammonia to the filtrate.
- Secretion is an important step too, because it keeps the ionic and acid–base balance of the body fluids.
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