Question

the functional unit of the kidney is known as the ______.
renal cortex
ureter
nephron
renal medulla
rewatch

Explanation:

The functional unit of an organ is the smallest structure that performs its core functions. For the kidney, the nephron filters blood, reabsorbs nutrients, and produces urine—these are the kidney’s key roles. The renal cortex and medulla are regions of the kidney, not functional units; the ureter is a tube that carries urine away, not a functional unit of the kidney itself.

Answer:

nephron