Nephrons, which contain loops of henle, are the filtering structures in the kidney.
nephron
glomerulus
nephron
From the blood via filtration in the kidneys
urethra
Urinary Bladder
No, the urinary bladder adn gallbladder are two different things.
The Urethra
mormanism
For the most part the brain doesn't directly control the urinary system but their is some control over the rate of glomerular filtration by the sympathetic nervous system.
The kidneys
the urinary bladder
The bladder holds the urine 