What do you think is the most important structure in the urinary system?

In my opinion, the urethra are the most important structure in the Urinary System. It is the last step in ridding our body of liquid waste. In essence, every structure within the urinary system is essential and important because without a piece of one of them, we can't expel the toxins and excess fluids from our bodies.

Fiber doesnt contain any calories i believe