Also called statute mile. a unit of distance on land in English-speaking countries equal to 5280 feet, or 1760 yards (1.609 kilometers).
Urine formation begins in the renal corpuscle, where blood passing through the glomerulus is filtered. Filtrates include water, ions, and other solutes, which are filtered out of the blood and into the capsular space to begin urine formation. Urine passes into the proximal convoluted tubule, then into the nephron loop.The nephron concentrates urine by the process of the countercurrent multiplication system.iltrates include water, ions, and other solutes, which are filtered out of the blood and into the capsular space to begin urine formation. Urine passes into the proximal convoluted tubule, then into the nephron loop. The nephron concentrates urine by the process of the countercurrent multiplication system.
Urine leaves the bladder through a tube-like structure called the urethra. The lining of the urethra is epithelium.The wall of the urethra is smooth muscle. Urine flow is controlled by two uretheral sphincters: the internal urethral sphincter and the external urethral sphincter. The internal urethral sphincter is at the start of the urethra. This sphincter is composed of smooth muscle.he lining of the urethra is epithelium. The wall of the urethra is smooth muscle. Urine flow is controlled by two uretheral sphincters: the internal urethral sphincter and the external urethral sphincter. The internal urethral sphincter is at the start of the urethra. This sphincter is composed of smooth muscle.