The lungs are the major organ of the human respiratory system, which is a series of organs responsible for taking in oxygen and letting out carbon dioxide. The lungs carry out this exchange of gases as we breathe. Our lungs do not just allow us to breathe. They remove the oxygen and pass it through our bloodstream. There it enters and is carried off to the tissues and organs in the functioning parts of the human body.
It services the functions of walking, talking, and moving. Our lungs also take carbon dioxide from our blood, which can be regarded as waste, and this is then releases into the air when we breathe out. Plant life needs the carbon dioxide just as humans need the oxygen.