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steps for the formation of urine?
Urine is formed through a combination of four basic processes: 1) glomerular filtration, 2) tubular reabsorption, 3) tubular secretion, and 4) water conservation. Blood is under high pressure in the glomerulus; thus, plasma (except for plasma proteins) moves into the glomerular capsule. This fluid is called filtrate. As the filtrate moves along the tubules, it is referred to as tubular fluid. Most of the water and many other molecules are reabsorbed into the blood, while some substances are secreted into the tubular fluid. Once the fluid moves into the collecting, duct it is called urine. While in the collecting duct, additional water is removed from the urine, concentrating the wastes.


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