Students of biology and researchers in medicine have log been involved in the study of excretion and osmoregulation. The kidney is that vital organ that carries out the above named functions. Its implications in the maintenance of a stable body system makes this organ very important.

The formation of urine and all the processes involved is both an excretory process and a homeostatic process. You will gain more insights by reading the full article here. http://gulpmatrix.com/urine-formed-kidney-tubules/