Ollie found himself travelling down a tunnel. It seemed to have ridges in it to keep it open. He thought this must be a windpipe Ollie the Oxygen molecule was floating around one day when WHOOSH! He was sucked into a dark hole – he was in a mouth! Inside the lung, the tubes started to get narrower and narrower until he was in a tiny little air sac. The walls of the sac were very thin and he easily squeezed through. But then… Ollie reached a fork in the tunnel. Which way would he go down? Before he could think, he was whizzing down the left bronchus into the left lung Wheeeeee! He was in the blood and being carried along by the powerful force of the blood Ollie found himself travelling down a tunnel. It seemed to have ridges in it to keep it open. He thought this must be a windpipe Ollie the Oxygen molecule was floating around one day when WHOOSH! He was sucked into a dark hole – he was in a mouth! Inside the lung, the tubes started to get narrower and narrower until he was in a tiny little air sac. The walls of the sac where very thin and he easily squeezed through. But then… Ollie reached a fork in the tunnel. Which way would he go down? Before he could think, he was whizzing down the left bronchus into the left lung Wheeeeee! He was in the blood and being carried along by the powerful force of the blood