Question

what is the purpose of sending blood to kidney for filtration

Answer 1

So that the kidney can convert toxic Ammonia(NH3) to untoxic uric acid and through it out of blood and body by urea.
Hope it will help uu

Answer 2

The purpose is to purify the blood and separate unwanted wastes from it. When this is done, the required nutrients are alone taken by the blood for the proper functioning of the body. The rest unwanted waste is excreted out in the form of urine . Hope it is useful