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The first line of defence

The first line of defence

A pathogen is a microorganism that causes a communicable disease, such as a virus, bacterium, fungus or protist. Pathogens can cause disease after entering the body; many reproduce in or on body tissues and damage cells or release toxins.

6.3.9 Non-specific defence systems Lesson

  1. GCSE
  2. /Biology
  3. /6.3.9 Non-specific defence systems

Step-by-step lessons on OCR GCSE Biology 6.3.9 Non-specific defence systems. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons