What is the general shape of the epithelial cells that are nearest the lumen in an empty urinary bladder?

The general shape of the epithelial cells that are nearest to the lumen during an empty urinary bladder of an individual is transitional cuboidal epithelium, they are cuboidal in shape as they are relaxed and later transition when stretched and filled with urine.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."