neph·ron 
(nĕfrŏn)
(nĕfrŏn)n.
The functional excretory unit of the vertebrate kidney that regulates the amount of water in the body and filters wastes from the blood to produce urine.
[German, from Greek nephros, kidney.]
nephronA. renal vein
B. renal artery
C. blood vessels
D. blood
E. Bowman's capsule
F. glomerulus
G. collecting duct
H. urine
I. loop of Henle
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