The role of water for the human body
The adult human body consists of 70% water, children have water content in body tissues is up to 85%. Along with the water produced by the body, the toxins are removed and disposed of the decay products resulting from metabolism processes. Circulates the body, it ensures the supply of all internal organs with vitamins and microelements. So, within days after the brain is fifteen hundred gallons of water through the kidneys is about two liters.
But the liquid is not only constantly circulates in the body and its internal organs, it also constantly removed from it through sweat, urine and feces. Per day output of about 2.5 liters of fluid, which also contains some trace elements. Therefore, the supply of water, necessary for life support, must be constantly replenished. In the normal state to replenish water a person needs about 2-2,5 liters of water, but the needs of the body can increase if you are doing physical labor and sweating profusely or sweating stimulates hot weather.
One of the participants in the "Irish hunger strike" in 1981, lived for 77 days without food, eating daily only a small amount of water.
How much time a person lives without water
The lack of water in the body causes dehydration, which increases the density of blood and if the water does not flow, the blood eventually becomes so viscous that simply stops flowing through the veins and blood vessels, followed by imminent death. In normal circumstances, a person can live without water for 3-5 days, but if he is physically strong and trained, he will live a week. In medicine known cases where people have lived without a drop of liquid 10 days, but during this time his body has already occurred irreversible pathological changes.
Caravans in the desert, without water, placed in the mouth a small oval pebble and sucked it in my mouth not dry. It is possible to delay the symptoms of dehydration and get to the source.
But if the person would be without water in the hot desert, his death could occur within days – because of sweating and hence cooling of the body stops, he will die from heat stroke. Signs of dehydration are: dry mouth, rare urination, dark urine with a pungent smell of ammonia. In extreme stage, there is a feeling at the mote in the eyes begins to dry out the mucous membrane, and quickens the heartbeat. People may fall into a coma and lethargy, and he develops vomiting and diarrhea, and then comes shock and death.