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letamp;#39;s look at the Journey of air into the lungs so what we have is weamp;#39; inhaled the air itamp;#39;s gone through the nasal passage and now itamp;#39;s moving down the track here also known as the windpipe okay so this is what weamp;#39;re doing now weamp;#39;re in the windpipe and weamp;#39;re just about to enter the lungs and this is known as the bronchus or the the bronchi first the plural which gives the the lungs theyamp;#39;re kind of branching off and eventually whatamp;#39;s going to happen is weamp;#39;re going to travel and find an air sack so at the moment weamp;#39;re just branching off into the various broni which give the surface area of the the lungs and give it its large surface area so as you can see itamp;#39;s quite a large distance that this oxygen molecule is traveling as it travels into the lungs deep inside the lungs towards the next stop which is the ax so weamp;#39;re just continuing on on its little journey okay so now weamp;#39;re go
