I remember seeing something along time ago on TV. They where talking about how your blood can still react to your body even when it's nolonger inside your body.
The example thay used was like how your blood's white blood cells will start to act like it's trying to fight off a bug even if said blood is in a container at the time the bug is interduced into your body.
What is this process/ event called? Or did I just misstake this TV doc (it was on some crime thing and explained how they timed out the person's death or something)?
(I don't know if this is the right place for this topic so sorry if it isn't)

