I'm learning about immune system.

This last days the first topic we saw for the partial was immune system. I have to say that it is very interesting to me to figure out how our bodies deal to protect us from all those threats out there that may endager our lifes. The main thing of it, is that immune system can react for a microorganism for th first time and then, if later that microorganism attaks again, our body can react pretty faster than the first time because it has the ability to remember how to destoy that hazard like the first time.
It is controlled by many mechanisms and they're amazing. I'm happy of being in this career.