Biology / Unit 13 Bio 3285 short lesson, about 20 seconds
Antibody Classes and Functions
Captions available
The idea
Antibodies divide into five classes by constant region, each suited to a role: circulating widely, guarding mucosal surfaces, triggering allergic responses, or marking early infection.
In practice
One class crosses the placenta, giving a newborn temporary passive immunity before its own system matures.
Where people slip
Class describes functional role, not antigen specificity — the same variable region can appear on different classes.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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