How You Breathe In · Lungs
Two slippery membranes that couple the lungs to the chest wall.
Here's the puzzle: your lungs contain no muscle, so how does moving your ribcage move them? The answer is a pair of thin membranes with a film of fluid between them — the pleura — sticking the lungs to the chest wall the way two wet glass sheets stick together.
There's more: two slippery membranes that couple the lungs to the chest wall. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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