Question

About 180 litre of filtrate is produced each day but only 1.5 litre urine is excreted out .Justify this.

Answer 1

About 99% of the glomerulus filtrate reabsorbed by renal tubules. Out of 180 liters of the filtrate, only 1.5 liters excreted as urine. This reabsorption of materials or substances performed by the active or passive mechanism.

The substances like sodium ions, glucose, and amino acids are reabsorbed actively. On the other hand, nitrogenous substances are reabsorbed by the passive transport mechanism.

Reabsorption is done to reabsorb those materials which are needed by the body. These materials are reabsorbed and go back to the bloodstream. Water is reabsorbed to maintain a constant water level in the body.