The immune system uses intricate processes to defend our organism. In this sense it may be compared to a castle. In fact, the metaphor of a castle that protects from outside aggression as well as from inner dangers is an illustrative way to picture our immune defence.

The metaphor offers an easy way to memorise the most important aspects and functions of the immune defence. This video takes you on a tour that may help you memorise the functions and topography of the immune system. Which is your favourite character in the metaphor?

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