Cell mediated immunity

Okay kiddo, so our body has tiny little things called cells that help keep us healthy. Some of these cells are really good at fighting off bad things like germs that can make us sick. This is called our immune system.

Cell mediated immunity is when certain cells in our immune system go on a mission to find and destroy bad things. These cells are called T-cells, and they're like little soldiers that go around looking for trouble (bad germs). When they find something bad, they attack it and try to destroy it.

But how do these T-cells know what to attack? Well, they have little "keys" on their surface called receptors that help them recognize certain things. They can recognize things that are different from our own cells, like germs or cancer cells.

T-cells also need other cells to help them out. One type of cell is called an antigen-presenting cell (APC). These cells find the bad things and take little pieces of them and show them to the T-cells. This helps the T-cells know what to look for.

Once the T-cells know what to look for, they get really excited and start multiplying. This means there are more T-cells to fight off the bad things. They can even remember what they've fought before, so if they see it again, they can attack it even faster.

So, cell mediated immunity is just one way our immune system fights off bad things. T-cells are like little soldiers that go on a mission to find and destroy the bad things. They need help from other cells to know what to look for, and once they find it, they multiply and attack. It's pretty cool, huh?