How Your Immune System Remembers Germs

Science · The Human Body · ages 11-13

Name ______________________ Date ____________

What do B cells produce to target one specific germ?
- Antigens
- Antibodies
- Skin barriers
Which type of immunity reacts immediately, using barriers like skin and general inflammation?
- Innate immunity
- Adaptive immunity
- Both react equally fast
Adaptive immunity reacts within minutes, just like innate immunity.
Circle one: True False
Why do you often feel sick for a shorter time if you catch the same illness again?
- Memory B and T cells respond faster the second time
- Your skin barrier becomes thicker after the first illness
- Innate immunity remembers the exact germ
A virus has a specific antigen on its surface. Which antibody can bind to it?
- Any antibody made by the body
- Only T cells can bind to antigens
- Only an antibody shaped to match that exact antigen
A splinter gets infected and the skin turns red, warm, and swollen. Which system mainly causes this reaction?
- Adaptive immunity
- Innate immunity
- Memory cells
Priya says a vaccine gives her the full disease so her body can practice fighting it. What is wrong with her idea?
- Vaccines stop memory cells from forming
- Vaccines skip adaptive immunity completely
- Some vaccines, like the chickenpox vaccine, use a weakened or partial piece of the germ, not the full disease
The graph shows antibody levels after meeting a germ twice. How many times higher is the second response than the first?
Answer: ______________

Answer key

For grown-ups. Fold this page away before handing over the rest.

Antibodies · B cells make antibodies, proteins shaped to grab onto one specific antigen.
Innate immunity · Innate immunity is your fast, first-line defense. It works the same way against every germ.
False · Adaptive immunity takes days to build up the first time, though it remembers for next time.
Memory B and T cells respond faster the second time · Memory cells from the first infection recognize the germ instantly and respond faster and stronger.
Only an antibody shaped to match that exact antigen · Antibodies are specific. Each one is shaped to match only one antigen, like a key fitting one lock.
Innate immunity · Redness, warmth, and swelling are signs of inflammation, part of the fast innate response.
Some vaccines, like the chickenpox vaccine, use a weakened or partial piece of the germ, not the full disease · A vaccine trains your immune system to recognize a germ without making you sick, so memory cells still form.
4 · 8 is 4 times 2. Memory cells make the second response much bigger and faster than the first.