If the lungs cannot function, the body can't get any oxygen. Oxygen is necessary for cellular respiration, the process that breaks down sugars to create energy for the cell. If cells cannot get get the energy they need to carry out vital functions, the cells will die, along with the organism they make up. In short: if the lungs don't function, the cells of the body get no oxygen, and the organism dies.
You would stop breathing.
you die
you get hiccups
whan your muscles dont get oxygen the dont work or they dont work properly.
You get diabetes
pcv valve wont work properly
You'll get lung sickness such as lung cancer.
If it was playing an important role, then wherever you took it from will no longer work properly.
you die
You get lung cancer!!
You die!
The blood is not filtered and waste products build up to toxic levels.
what it does is to work on the body breathing
there would be difficulty in standing upright and walking of any living organism that can move