How do lungs bring oxygen into the body?
The Oxygen Express
How do lungs bring oxygen into the body?
Every breath you take is a delivery mission. Right now, trillions of tiny workers inside you are desperately waiting for their oxygen shipment — and your lungs are the loading dock where it all comes in.
It starts when you breathe in. Air rushes down your windpipe and splits into two tubes — one for each lung — like a highway forking left and right. But the roads don't stop there. Each tube branches again. And again. And again. Twenty-three times total, getting tinier each split, until they end in microscopic dead-end sacs called alveoli. You have about 300 million of these little air bubbles. If you unfolded them flat, they'd cover a tennis court.
