Nephrons are the structural and functional units of the kidneys.
Blood is filtered in the kidney.
Nephrons are the structural and functional units of an organ that filters blood.
What are the structural and functional units of the organ that filters blood?
Options:
(a) lungs
(b) nephrons
(c) humans
(d) pancreas
(e) eardrum
(f) alveoli
(g) epidermal
(h) organ