1 a) What is a pathogen? 1 b) How do white blood cells help to defend the body against pathogens?

1 a) a microorganism that causes infectious disease

1 b) White blood cells:

- Ingest pathogens

- produce antibodies which destroy particular bacteria or viruses

- produce antitoxins which counteract the toxins released by the pathogens.

Answered by Lauraa B. Biology tutor

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