1G3 have been building models to show how the diaphragm works to make you breathe in. The diaphragm is a sheet of muscle which runs under your ribcage. It pulls down to make you breathe in. This makes the whole chest cavity bigger and pulls air in from outside. When the diaphragm relaxes, it moves up. This makes your chest cavity smaller again, pushing the air back out.

When the diaphragm is pulled down, the lung inflates.

Kiedy membrana jest rozebrana, płuca nadmuchuje.

When the diaphragm relaxes back up, the air is pushed out of the lungs again.

(Nice photo bomb, Miss Mc!)