Question

multiple choice question
the functional filtration unit in a kidney is the _.
renal cortex
vasa recta
calyx
nephron

Explanation:

The nephron is the functional unit of the kidney responsible for filtration. The renal cortex is a part of the kidney's structure, not the functional filtration unit. The vasa recta is a blood vessel related to the nephron but not the filtration unit. The calyx is involved in collecting urine, not filtration.

Answer:

nephron