The average person, (21 year old male with a weight of 83kg/183lbs), has 6 l/12.6pts of blood - loss of1/3 is fatal. Loss of blood = loss of OxygenThe patient will go into Hypovolemic Shock... Signs & Symptoms of Hypovolemia: Deterioration of levels of consciousness,Rapid shallow breathing,Rapid week pulse,Cold clammy skin.Nausea & Vomiting,Death As the patient looses more and more blood the brain will fight to stay alive - 'Fight or Flight syndrome' - and actually make the problem worse!