There is a gall bladder and urinary bladder. In English, when people say "bladder," they mean urinary bladder.
The urinary bladder collects and holds urine from the kidneys. The gall bladder holds and concentrates bile that is made in the liver, releasing it whenever fatty foods need digesting.
The urine inside the urinary bladder is sterile.
they are part of the urinary bladder.
near the intestines and by the ovarys