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How Your Immune System Works

From How the Body Works

How Your Immune System Works
7 min2nd3rd4th5th6thScienceHealth
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Summary

Meet your body's defense team. Chloe and Nurb explain how the immune system spots germs that could make you sick and sends special cells to fight them off — and how recovering from an illness leaves your body better prepared for next time.

Viewer safety

All ages
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Teaching resources

Discussion questions

Discussion

Watch, then talk it over.

  1. What is the immune system's main job?
  2. What are germs, and how do they get into your body?
  3. How does your body fight off an invader once it finds one?
  4. Why might you not catch the same illness twice after you've had it?

Quick work-a-long

Words to know: immune system, germs, white blood cells, antibodies

Try it: Draw your immune system as a team of defenders. Label one "defender" and write what it does when a germ shows up.