Biology: Year 9 Term 4: Human Defences 0.0 / 5 ? BiologyMicrobes and diseaseDefencesGCSEAQA Created by: Charlotte HerondaleCreated on: 17-12-18 16:35 Name 2 external defence systems (2) Eyes - tears contain enzymes, Skin - antibacterial oils 1 of 7 Name 2 internal defence systems (2) Stomach acid, Mucus in trachea 2 of 7 What forms the immune system? (1) White blood cells 3 of 7 What do phagocytes do? (2) Engulf pathogens, Digest with enzymes 4 of 7 What do lymphocytes do? (2) Produce antibodies and antitoxins 5 of 7 What do antitoxins do? (1) Counteract bacterial toxins 6 of 7 What do antibodies do? (4) Specific to a bacterial antigen, Connect to it and clump together, Phagocytes engulf, Store memory so can be easily destroyed next time 7 of 7
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