Innate vs adaptive immunity
MCAT glossary · Biological & Biochemical Foundations of Living Systems
Definition
Innate: fast, non-specific (skin, complement, neutrophils, macrophages, NK cells); adaptive: slow, specific, memory (B cells/antibodies, T cells).
Innate vs adaptive immunity in plain English
Your body has two defense teams against germs. The innate team is the always-ready bouncer squad: fast and general, it attacks anything that looks foreign without knowing exactly what it is — this includes your skin barrier and roaming cells like neutrophils and macrophages that gobble invaders. The adaptive team is the slower detective squad: it studies a specific germ, builds custom weapons (antibodies from B cells) and specialized T cells against exactly that enemy, and — crucially — remembers it, so next time the response is lightning-fast (that memory is why vaccines work). Fast-but-generic versus slow-but-precise-with-a-memory is the key contrast.
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