Story+Version

Ken

Story Version: I create a story version for the immune system information. Hope it makes the vocabularies easier to understand.

The security system **(immune system)** protects the building **(body)** from the attack of terrorists **(pathogens)** which is either human terrorists **(bacteria)** or robot terrorists **(viruses)**. While the human terrorists are alive and robot terrorists are not alive, they both can seriously damage the building. The room that has been attacked by robot terrorists will send out an alarm (**interferons)** telling the other rooms to be alert and not letting those robot terrorists in.

The securities **(white blood cells)** can distinguish terrorists by their uniform or outfit (antigens). There are 3 main types of securities: B securities **(B cells)**: attack the terrorists before they attack the buildings. T securities **(T cells)**: attack the terrorists after they attack the buildings. P securities **(phagocytes)**: eat the terrorists.

There are 2 main defending strategies against terrorists: -The old strategy **(passive immunity)** is either from the last generation’s experiences. -The new strategy **(active immunity)** is a defending strategy when a new group of terrorists attack the building. The new strategy can be done by different securities. It’s called **humoral immunity** when B securities defend the building. It’s called **cellular immunity** when T securities defend the building. There is a special type of the new strategy when the details of the last attacks can be saved into a memory file **(memory cells)** and securities can be trained to remember those.