What is the purpose of bugers?

Answer 1

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Boogers are dried-up snot and dirty nose debris. They can be small, slimy lumps or big, dry, brown clumps. Either way, boogers are filled with the junk that's in the air you breathe. Dust, pollen, germs, sand, fungi, smoke, small particles from outer space! The good thing about your mucus is that it helps trap all this junk and keep it from getting close into your lungs.

Function:

It seems like the main function of mucus, snot, boogers, whatever you want to call it is to trap particles, junk in the air inhaled through the nose and keep our lungs clean. Exhaling through the nose helps to expel, to push out the mucus with the trapped dirt in it. Our nose really acts like a vacuum cleaner for the air, and blowing our nose is like emptying the bag.