Nephrons are the structural and functional units of the kidneys, and normally the kidneys manufacture urine. Given these facts, nephrons are the structural and functional units of what among the following options:
- Something coming from a gland
 - A compound that donates proton
 - urine manufacturing organs
 - Veins and arteries.
 - critical organs
 - sensory neurons
 - food and shelter
 - the body's largest organ


 

   urine manufacturing organs      