Urine is normally composed of water and wasted products filtered
form the body. The kidney produces urine. The other main function of the
kidney is to regulate fluid balance in the body. It performs this function by
using a selective osmosis system. Basically, the way it works is that
electrolytes (dissolved salts like sodium, potassium, calcium, carbonate,
chloride) are pumped back into or out of urine and blood so that in the end,
just the right amounts of electrolyte and water exit the kidney blood vein.
The rest ends up in urine. Interestingly, normal urine is sterile and has no
bacteria.
urine and urea
Urine chemistry
Chemistry of urine below. If you want to components of urine these are: urea, uric acid, creatinine, sodium, potassium, calcium, magnesium, water, chloride, ammonia, sulphate, phosphate
colors of urine
some kind of materials can change the color of urine is the
vitamin B2 (riboflavin). If you swallow a vitamin B2 supplement, and the amount is more than your body needs, the vitamin is excreted in the urine.
The urine will be a VERY bright yellow - almost fluorescent (except it probably will not glow in the dark). But there is nothing wrong with you when this happens - it is just your body getting rid of extra vitamin B2.
Some health authorities use this as an example that taking large doses of vitamins only makes expensive urine. However, nutritionists who advocate
large vitamin supplementation counter by saying that it is only when the
excess amounts of vitamins spill over into the urine that you know for sure
that your body is getting the maximum amount of the vitamins.
The Urinary System
The urinary system, which is primarily concerned with the removal of nitrogenous waste products from the body.
The kidneys function in several capacities: as an excretory organ, maintaining electrolyte continuity, stabilizing the acid-base balance, and maintaining an adequate fluid balance. The urinary system consists of two kidneys, two ureters, a bladder, and a urethra. As the kidneys filter toxins from the blood, these toxins are deposited out of the body in urine; at the same time the kidneys are retaining those substances that help maintain a state of homeostasis within the body.
The formation of urine by the kidneys involves several steps: filtration, reabsorption, and secretion. The malfunction of the kidneys can alter one’s state of wellness drastically, and if untreated can cause irreversible damage to the kidneys and even death



