"Why do we write?" Such "childish" question was sent to us from Kate, Ozersk. I think this is a very simple question? Read our answer - maybe you together with Katya will learn a lot!
Any living organism is designed so that to sustain it must, on the one hand, to consume energy in the form of food, and on the other to get rid of residue recycling of nutrients.
By the way
In humans and animals relieve the body of all the excess occurs in several ways:
1) with the urine through the kidneys;
2) then by the evaporation of sweat from the skin surface;
3) with the bile and feces through the intestines;
4) from exhaled air through the lungs.
The kidneys constantly filter the blood and cleanse it from the products of metabolism, toxic compounds, excess salt and fluid. Every 5 minutes through the kidneys passes all the blood contained in the body.
Kidney harmful and unnecessary substances from the blood dissolved in the water so formed urine. It comes from the kidneys to the bladder where it accumulates there, and then excreted from the body.
A day one highlights from 0.8 to 1.5 litres of urine. Urine composition depends on many factors: age and sex of the person, his health, nutrition, and environmental factors such as temperature and humidity.