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3.1.6 Human defence systems
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First lines of defence

First lines of defence

A pathogen is a microorganism that causes infectious disease. Pathogens include viruses, bacteria, protists and fungi.

3.1.6 Human defence systems Lesson

  1. GCSE
  2. /Biology
  3. /3.1.6 Human defence systems

Step-by-step lessons on AQA GCSE Biology 3.1.6 Human defence systems. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons