The Immune System: Every Defence, Explained (GCSE Biology)

The immune system for GCSE Biology: every defence your body has against pathogens, from the outside in, as a 3-second quiz (keep score). Skin, nose hairs, mucus and cilia, stomach acid, lysozyme in tears, phagocytes, antibodies, antitoxins, memory cells, vaccination, herd immunity, painkillers, antibiotics, antibiotic resistance and monoclonal antibodies (triple science). Also covered: the four types of pathogen (bacteria, viruses, fungi, protists), how bacteria and viruses make you ill, the secondary immune response, Edward Jenner and smallpox, Alexander Fleming and penicillin. For AQA, Edexcel, OCR and WJEC/Eduqas GCSE Biology and Combined Science (Infection and response). 📄 FREE WORKSHEET (PDF, 20 questions): https://drive.google.com/file/d/195rI... ✅ ANSWERS (PDF): https://drive.google.com/file/d/106QJ... Chapters 0:00 Know your enemy 0:44 Skin 1:12 Airways 1:44 Stomach acid 2:04 Tears 2:31 Phagocytes 2:59 Antibodies 3:37 Antitoxins 4:04 Memory cells 4:31 Vaccines 5:14 Herd immunity 5:42 Painkillers 6:08 Antibiotics 6:52 Resistance 7:30 Monoclonal antibodies 8:08 Your score EXAM TIP: the three jobs of white blood cells (phagocytosis, antibodies, antitoxins) come up almost every year. Learn them word for word. Write your score in the comments! Every ___, Explained: one big topic, every piece of it, explained simply. #gcsebiology #immunesystem #gcsescience