A tidy little unit!
Here is the likely content for SAT:
Pneumocyctes Type 1 appear in the IB syllabus for the first time. (Type II are concerned with the secretion of surfactants.)
Macrophages are important in the immune system and are referred to in Topic 6.3, Defence against Infectious Disease.
Animal gas exchange – how and why? Putting the human gas exchange system into context. A fairly straightforward powerpoint. AnimalGasXC how and why
A thorough and complete powerpoint, covering most of the topic: comprehensive advanced good ppt
IB PAST PAPER QUESTIONS