Zoology - Excretory Products and their Elimination Question with Solution | TestHub

Concentrating urine is very important because this will prevent huge water loss and salt imbalance through our bodies. This is done through a counter-current mechanism that operates in the kidneys. This takes place because the loop of Henle and vasa recta are parallel to each other but the flow within them are in opposite direction. This opposite flow is counter current. This causes movement of Nacl and urea and thus water and salt balance is maintained.