Final answer:
Urine is transported out of the kidneys by the ureters and stored in the urinary bladder until urination. During urination, the urine travels through the urethra and is excreted from the body.
Step-by-step explanation:
Excretion of Urine through the Urinary System
The structure that carries urine out of the kidney is the ureter. Each kidney is connected to its own ureter, a muscular tube that transports urine to the urinary bladder. The urinary bladder, a sac-like organ, stores the urine until it is ready to be excreted. When urination occurs, urine travels from the bladder through the urethra, another muscular tube, and exits the body through the external urethral opening. The urethra has significant anatomical differences between males and females, but the other structures involved in urine transport are identical between genders.
Urine formation begins in the kidneys, where it is collected in the renal pelvis and then transported via the ureters to the bladder. Inside the bladder, urine is stored and protected until the body is ready to dispose of it via the urethra. The act of urination is controlled by sphincters and requires the conscious relaxation of these muscles to allow urine to flow out of the body.