What you'll learn
How the body stays healthy and fights disease.
Key ideas
- Pathogens and how disease spreads.
- Defences: white blood cells and antibodies; vaccination.
- Antibiotics (and resistance); risk factors for heart disease.
Exam tips
- Explain how vaccines create immunity.
- Remember antibiotics don't work on viruses.
Common mistakes
- Saying antibiotics kill viruses.
- Forgetting lifestyle risk factors.