https://schooltv.nl/item/proefkonijnen-in-de-klas-hoelang-kun-je-je-adem-inhouden-onder-water
https://schooltv.nl/item/clipphanger-wat-is-astma
https://schooltv.nl/item/clipphanger-wat-is-hyperventileren
https://schooltv.nl/item/clipphanger-wat-is-snurken