Kidney: Kidney which is the excretory organ system in our body. It is pair and bean like shaped located in the dorsal side and abdominal cavity. It is about 10 cm long, 5 cm width and 2 cm thickness. It performs many specific function in our body. It performs homeostasis functions as well as osmoregulation discuss as below: Kidney Function of Kidney: Kidney performs many regulatory functions in our body. The main function of the kidney is to filtrate and remove waste from our body. Kidney taken the toxic substance from the impure blood which is enter into our body by the nutrients and filtrate it to the pure blood and supplies to body and remove harmful substance from the body. 3d Kidney The blood which is flows the kidney to filtrate is about 1100 to 2000 liters each day. And the nephron filtrate the blood about 180 liters and excrete about 1-2 liter of urine (toxic substance). Function of kidney is perform by the processes of: Ultra Filtration Re-abs