Biology › Section Q · Immunity and reproduction › Topic Q.1

Innate immune response

Your body fights off most microbes before you ever notice them. The innate immune system does that work: barriers, engulfing cells, inflammation and defensive proteins that act within minutes and treat every intruder in much the same way.

In this topic

  • Defence without memory
  • The first barriers
  • Recognising and eating intruders
  • The innate cell crew
  • Inflammation
  • Cytokines, fever and interferons
  • Natural killer cells
  • Complement
  • Worked example: a splinter
  • Worked example: which cells do NK cells kill?
  • Common mistakes to avoid
  • Key takeaways

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