Science Class 8
Health: The Ultimate Treasure
How illness spreads and is stopped, kinds of illness, and what antibiotics do.
16 lessons · ~96 min total
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Lessons in this topic
- 0 Start here A roadmap: sides of health, routes for germs, kinds of illness and antibiotics. · 3 min You are here
- 1 More than not being ill Health has three sides: physical, mental and social. · 6 min
- 2 How an illness spreads A pathogen travels from one living thing to another, and every route is a chain of steps. · 7 min
- 3 Insects that carry germs A vector is an insect that carries a pathogen. Mosquitoes need still water to breed. · 7 min
- 4 The body's own defences Barriers on the outside stop many germs, and the immune system inside deals with the rest. · 7 min
- 5 The second time A body that met a germ usually fights it sooner next time. · 7 min
- 6 A vaccine A vaccine trains the body before the germ arrives. It helps prevent illness. It does not cure it. · 7 min
- 7 Cutting the route Everyday steps cut links in a route, and the order of the steps matters. · 7 min
- 8 Checkpoint: how illness spreads Five quick checks on health, germs, insects, defences and the second meeting. · 4 min
- 9 Two kinds of illness A communicable disease can spread to other people. Others cannot. · 6 min
- 10 Felt or measured? A symptom is what a person feels. A sign is what others can see or measure. · 6 min
- 11 What an antibiotic does Antibiotics work against bacteria, not viruses. A doctor decides if one is needed. · 7 min
- 12 Resistant germs Bacteria can become resistant to an antibiotic. The person does not. · 7 min
- 13 Checkpoint: kinds of illness and antibiotics Five quick checks on communicable diseases, symptoms, signs and antibiotics. · 4 min
- 14 The big picture Eleven ideas about health and illness, on one screen. · 4 min
- 15 Track quiz Eleven rules, then twelve questions on health, illness and antibiotics. · 7 min
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