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ROLE OF PHLEGM On the way

ROLE OF PHLEGM
On the way lungs all airways are lined with a sticky substance called mucus.
It's there to mop up things like bacteria, viruses and particles of dust and dirt from the air.
The linings of our lunch have tiny thread-like projections. 
They all beat in the same direction thereby creating a current which pushes the mucus out of our lungs and up to our stomach where stomach acid kills all the bacteria.
But if due to some reason (infection) phlegm is produced in excess, then body gets rid of it through coughing.

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