Lung is the main organ of human body.human body contain two lungs which are at the side of the chest of human body they are protected by the rib of the human body ae say that the human body is depended on the lungs there are lungs sacs 

   when a man inhale air into the body it directly goes into the lungs.air contain mixture of gases here the air is purified and the oxygen mixed with the blood and the carbon dioxide is exhale by the body

       if the lungs are damage then there is the problem of inhale and exhale of the air the lungs are mainly damage by the smoke and environment pollution when a man can smoke then the cancer built up in the lungs of the body thus the damaging start in the lungs the time become the time came when the whole lungs are damage and even a man can not respire easily so that with out respiration the life is not possible because the lungs are the main organ of respiration so it depend upon us that how we can protect our body.