Collecting duct
This is a long duct extends from cortex of kidney to the inner parts of medulla.
Large amount of water could be reabsorbed from this region to produce concentrated urine.
Collecting tube unit forming larger duct
Papillary duct
Minor calyx
Major calyx
Renal pelvis
Urine drain into ureters
After collecting duct glomerular filtrate is called urine.

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