Health - The Body’s Defences - GCSE Biology

How does your body stop pathogens from making you ill — and what happens when they get through?In this GCSE Biology episode, we explore Health – the Body’s Defences, focusing on how the human body prevents disease and how infections spread. You’ll learn how sexually transmitted infections (STIs) such as chlamydia and HIV are transmitted, why they can be dangerous, and how their spread can be reduced through condom use, testing, and modern treatments.We then break down the body’s first line of defence, including:Physical barriers such as skin, mucus, and ciliaChemical defences including hydrochloric acid in the stomach and lysozymes in tears and salivaThis episode is designed specifically for GCSE Biology and Combined Science students, using clear explanations, exam-ready language, and memorable imagery to help you understand — not just memorise — how disease prevention works.🎯 Perfect for:GCSE Biology revision (AQA, Edexcel, OCR)Combined Science exam preparationUnderstanding pathogens, immunity, and disease preventionStudents who want concise, high-impact explanations in under 5 minutesListen now to strengthen your understanding of pathogens, STIs, immunity, and the body’s defences — and boost your confidence for GCSE exam questions.