Natural killer cells patrol your body and check the cells they meet. If a cell looks sick, they stop it right away.
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Natural killer cells, or NK cells, are a kind of white blood cell. They are round, with a nucleus and lots of little packets called granules.
They travel in your blood and visit places like your liver, spleen, and lymph nodes.
NK cells don't need to meet a germ first to know something is wrong. They are ready from the start. That's why they are called natural killers!
Healthy cells wear little tags that say "I'm one of you, I'm OK." Some sick cells, like cells taken over by viruses, lose these tags.
Scroll up to the 3D model and press Check the tags, then Release the granules.
By The Magic School Bus. A fun video for kids.
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