You are presented with the question "where do fluid in the kidneys collect?" and the following answer choices: 
- bowels
 - ducts
 - alveoli
 - liquid
 - solutes
 - tubes
 - arteries
 - matter

Now knowing that nephrons are the structural and functional units of the kidneys and finally, the fluid in the nephron reaches a collecting duct , choose the best answer.


 

  ducts       