1. The human body is thirsty when it lacks 1% water. When the human body is short of water by 2%, the thirst will be enhanced. 3. When the human body is short of water by 3%, the blood volume of irritability decreases. 4. It is disgusting that the human body lacks 4% water. 5. When the human body is short of water by 5%, the expression is indifferent and the limbs are sore. 6. When the human body is short of water by 6%, the body temperature and pulse will increase. 7. When the human body lacks 7% water, it will have a headache and mental retardation. 8. When the human body lacks 8% water, the head and eyes are dim and the breathing is short. 9. When the human body lacks 9% water, it is weak and mentally confused. 10. The human body is short of water, 10% has muscle disorder and delirium. 1 1. When human body is short of water 1 1%, blood volume is low, and kidney and liver are damaged.