How does the human immune system fight off diseases?

The human immune system is like a superhero team that fights off tiny invaders to keep you healthy.

Imagine your body is like a castle, and every time you get sick, it’s because tiny bugs, like germs or viruses, are trying to sneak in through the gates. The immune system is the guard dog and the knights who rush to protect the castle when they see trouble.

When a germ sneaks into your body, special cells called white blood cells jump into action. These are like the brave knights of the castle, they attack the germs directly.

Sometimes, the immune system needs help from other soldiers. For example, it might send out messengers (called antibodies) that tell other parts of the body to join in the fight. It’s like calling for backup when the battle gets tough.

After a while, your body remembers the germs it has fought before. That means next time they come back, your immune system can beat them faster, just like how you get better at playing a game every time you play it again!