Here are some very clear clips for the immune responses to infection, starting with a really well done explanation of Burnet’s Nobel-winning clonal selection theory:
If you like that, check out some more of the videos from the Walter and Eliza Hall Institute of Medical Research.
Try this animation and quiz: McGraw Hill Online Centre
Phagocytosis in action:
Neutrophil (phagocyte) chasing a bacterium:
How does the leukocyte know where to go? Chemotaxis – from Wisc-online
Once you’re sure of how it all works, can you narrate this medical animation?
And for another of the body’s defenses: Natural Killer Cells
Loads more links to clips at North Harris College.