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Two Complementary Immune Arms
- The immune system has two partnered arms: innate (fast, broad) and adaptive (slower, specific).
- They form a continuum where some cells act more like immediate pawns and others like strategic generals.
Adaptive Immunity Learns By Selection
- Adaptive immunity 'learns' by selecting and expanding cells that best recognize a pathogen's shape.
- This selective expansion creates memory cells that persist to respond rapidly on re-exposure.
Memory Cells Are Strategically Stored
- The body stores memory B and T cells in strategic locations like barriers and bone marrow.
- These reserves enable rapid antibody production or local defense when pathogens return.