What are the functional units of the kidney?

Ureters are the tubes that carry urine from the kidneys to the bladder, but they do not participate in the filtration or urine formation processes. Their function is primarily transportation, not filtration, which distinguishes them from the functional units of the kidney.

Glomeruli are networks of capillaries located within the nephron that facilitate the initial filtration of blood. While they are essential components of the nephron, they do not represent the entire functional unit of the kidney on their own, as they are part of the nephron structure.

Renal capsules, also known as Bowman’s capsules, are the structures that encase the glomeruli and play a role in the filtration process. However, similar to glomeruli, they are not standalone functional units; rather, they are part of the nephron, which is the true functional unit of the kidney.