How the lungs work — breathing

Drag the diaphragm, or toggle inhale / exhale — watch the chest

Diaphragm — pull down to breathe in

Chest volume

low

Lung pressure

high

Pull the diaphragm down (or press Inhale) to flatten it, lift the ribcage and inflate the lungs.

diaphragm lungs ribs

It's the change in volume that changes the pressure — and pressure differences make the air move.