ANATOMY

Detailed explanation-1: -The main function is to eliminate waste from the body.

Detailed explanation-2: -Urethra. This tube allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder. At the same time, the brain signals the sphincter muscles to relax to let urine exit the bladder through the urethra.

Detailed explanation-3: -Urine is the liquid waste the kidneys produce. It’s the result of your kidneys filtering your blood and removing extra water and various waste substances. After the kidneys make it, urine travels through ureters to the bladder where it stays until you’re ready to urinate.

Detailed explanation-4: -The urinary system is divided into two parts. The upper urinary system includes the kidneys and ureters. The lower urinary system includes the bladder and urethra. The kidneys remove waste and extra fluid from the blood to make urine.