Biology Unit 1.4 Revision Notes (Lungs)

I hope you find these useful!

Basically, I have divided my notes up into parts of the syllabus, so 1.1, 1.2, 1.3, 1.5 and 1.6 are separate documents, but are all on here.

The part of the syllabus relevant to these notes is on the cover page at the start of the notes.

Sorry for any spelling mistakes or anything :L.