Label the following diagram.
1-Kidney, 2-Ureter, 3-Urinary bladder, 4-Urethra
The urinary system in humans consists of one pair of kidneys (1) and the corresponding pair of ureters (2) that collect the urine formed and move it to a urinary bladder (3) that stores the urine until it can be excreted out through a tube called the urethra (4).