Production of Urine in the Nephron and Kidney Urine is the product of four processes, listed and described below. In the Bowman's capsule Water and other small molecules, such as salts, urea, glucose, amino acids, are filtered from the blood and enter the Bowman's capsule Reabsorbtion Descending and ascending loops of Henle and in distal tubules Water, salts, amino acids, glucose are returned to the kidney and ultimately to the blood. These are all substance s that the body can use. Excretion Collecting ducts, renal pelvis, ureter, bladder and urethra. Urine is removed from the body.
Water always moves by osmosis.
Desert adapted mammals have long loops of Henle for reabsorbing water. These animals excrete little or no urine. Some desert mammals produce urine that has 20 times the osmotic concentration of blood.