Fact 1: Nephrons are the structural and functional units of the kidneys.

Fact 2: Finally, the fluid in the nephron reaches a collecting duct .

Given the two facts above, answer the question "where do fluid in the kidneys collect?" with the following options: 
- bowels
 - ducts
 - alveoli
 - liquid
 - solutes
 - tubes
 - arteries
 - matter


 

  ducts       