Every breath you take brings in tiny bits of dust and germs. Alveolar macrophages crawl around inside your lungs and gobble them up.
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Deep inside your lungs are millions of tiny air bubbles called alveoli. This is where oxygen moves from the air into your blood.
Alveolar macrophages live right inside these air sacs. They are big, roundish cells that slowly crawl along the walls.
Alveolar macrophages are sometimes called dust cells because they eat so much dust!
Clean air helps them out. That is one reason why smoke is so bad for your lungs.
Press Eat the dust on the 3D model and watch the dust disappear.