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

Fact 2: Blood is filtered in the kidney.

Given the two facts above, answer the question "What are the structural and functional units of the organ that filters blood?" with the following options: 
- lungs
 - nephrons
 - humans
 - pancreas
 - eardrum
 - alveoli
 - epidermal
 - organ


 

  nephrons       