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YouTubeCognito
GCSE Biology - Immune System & Defences | Types of White Blood Cell (2026/27 exams)
⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The Human Body's Defence System Overview * Distinction between physical/chemical barriers and the immune system. 2. Physical & Chemical Barriers Against Pathogens * Role of the skin (physical barrier, secretions). * Defences in the nose and airways (hairs ...
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