The Journey of Jon the Oxygen Atom

This is a short story I've written about the respiratory system and gas exchange in humans while studying for my IGCSEs. I know that the exam is already over but I couldn't find enough time to update it before that. I basically wrote this because I remember information more effectively and accurately when it's in story format. Also, names of my characters are coming from Bon Jovi, as it's my favourite band. I hope you enjoy it. :)))