2. Human defence against infection

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Dr Alex Lathbridge guides you through the most important GCSE Biology facts, with a few jokes thrown in too. In this second episode of our series all about infection and response, Dr Alex Lathbridge breaks down the key facts about the different defence systems humans have that help protect against invading pathogens. Non-specific defence systems include the skin, the nose, the eyes, the trachea and the stomach. Dr Alex also looks at how white blood cells called phagocytes and lymphocytes destroy pathogens. Take a look on the BBC Bitesize website to find out more about this topic, with revision notes, quizzes and exam-style questions: https://www.bbc.co.uk/bitesize/guides/zcqs2nb/revision/1 Suitable for: Combined science AQA Synergy AQA Trilogy Edexcel Eduqas OCR 21st Century OCR Gateway Single science AQA Edexcel Eduqas OCR 21st Century OCR Gateway