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3.1.6 Human defence systems
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The body's defence systems

The body's defence systems

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 covering AQA GCSE Biology 3.1.6 Human defence systems for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational topics and build up to the higher-tier material.