Nutrition Definitely is the process for the urinary system, which plays an important role in the regulation of fluid and electrolyte balance and acid-base balance of the body. Here the bladder is filled and clear amber liquid to the point that the nerves send signals to the bladder to contract, forcing us to go to the bathroom to expel the urine out of the body through the urethra. Nephrons in the kidneys back into the bloodstream proteins, salts, glucose, calcium and other nutrients selected our meals, to maintain an adequate level of blood composition. The kidneys also secrete hormones that regulate body functions such as maintenance of blood pressure and red blood cell production. The color of urine plays an important role in medical analysis. For example straw yellow normal color indicating the presence of yellow pigment can change to pink, (like water washing meat) in cases of hemoglobinuria and indicates the presence of blood in urine, a wine over red ...