Lesson 3 ·Class 9 · Aids to Health · Match Lab
Antibodies
Specific, and made to fit.
Match each term to what it means.
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Free play — tap an item on the left, then its partner on the right; each link tells you why. Switch to when you're ready to test yourself.
Antigen and antibody fit like a lock and key. That fit is why immunity to one disease gives none against another.
What this lesson covers
Challenges to clear
- Match every term.
- Connect the cell that makes a second attack by the same germ far milder.
The task
Match each term to what it means.
What this lesson covers
- Antigen — Any foreign substance that provokes an immune response (Usually a protein on the surface of a germ.)
- Antibody — A protein made by lymphocytes that binds one specific antigen (Made to fit that antigen and no other.)
- Specificity — One antibody acts against one antigen only (Which is why measles antibodies give no protection against mumps.)
- B-lymphocyte — The white cell that actually manufactures antibodies (It multiplies rapidly once it recognises its antigen.)
- Memory cell — A long-lived cell that responds far faster on a second exposure (The basis of lasting immunity and of how vaccines work.)
- Agglutination — Antibodies clumping germs together so phagocytes can engulf them (One of several ways antibodies neutralise an invader.)
- Antitoxin — An antibody that neutralises a bacterial toxin (Important in tetanus and diphtheria, where the toxin, not the germ, does the damage.)
Hint
Antigen and antibody fit like a lock and key. That fit is why immunity to one disease gives none against another.