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The body's first line of defence

The body's first line of defence

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

5.2.4 Human physical and chemical defences Lesson

  1. GCSE
  2. /Biology
  3. /5.2.4 Human physical and chemical defences

Step-by-step lessons on Edexcel GCSE Biology 5.2.4 Human physical and chemical defences. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons