Your question is poorly written, but I could still tell you that the functional unit of the kidney is the renal glomerulus, Bowman's capsule.
Explanation:
Bowman's capsule is the renal unit in the form of a hollow glans in which the substances to be excreted are filtered. It is located at the beginning of the tubular component of a nephron in the kidney of mammals. Enclosed within Bowman's capsule is the glomerulus.
