what are you asking? If your asking does say a bus driver have bathroom problems because he sitting down so much , YES. Just like a person that croutches on his job alot will eventually have poor leg circulation , YES.
analogy
the bulbourethral glands produces a thick, clear mucus that drains into the penile urethra. this secretion is the first to pass down the urethra when a man becomes sexually excited. it cleanses the urethra of traces of acidic urine, and it serves as a lubricant during sexual intercourse.
ground...
A mayor
A pipeline carrying milk in a dairy would be an analogy for ER.
to generate the cell supply
a carpenter's union
Post Office
possibly buses, since they move around the entire city.
It could be the ground, which holds the city together..
Waste Disposal landfills ; graveyards
The plasma membrane could be considered the gate to the city. :)