What happens to the vast amounts of bacteria and dust that the human body breathes in on a daily basis?

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What happens to the vast amounts of bacteria and dust that the human body breathes in on a daily basis?

In: Biology

Some dust that you breathe in, you breathe right back out. The dust that you don’t breathe out gets stuck in the mucus inside your lungs. In the mucus layer, there are a bunch of little wiggling “fingers” or “hairs” called cilia. The cilia are always slowly pushing the mucus in your lungs up towards your throat, where you swallow it.

Most of it gets dealt with. Bacteria and dust alike, most of it is harmless and finds its way out of your body. Some dusts refuse to leave, and these tend to be considered hazardous (asbestos, beryllia, etc…), as they build up and case damage. This isn’t the only reason these dusts are problematic, but it is one. Bacteria, meanwhile, usually need to enter your body in quite large numbers to cause problems. Not only this, but the vast majority of bacteria in the world actually don’t hurt you. They are not evolved to interact with humans, so they are like fish out of water.