1. Health is ‘a state of complete physical, mental and social wellbeing and not merely the absence of disease or infirmity.’
2. Micro-organisms are tiny living things that can only be seen using a microscope. 3. Bacteria are single-celled micro-organisms that have both positive and negative effects.
4. Fungi are micro-organisms that feed by absorbing food. They cannot make their own food. Fungi have both positive and negative effects.
5. Viruses are tiny micro-organisms that attack cells and use them to make more copies of the virus.
6. The immune system fights infection from bacteria and viruses. 7. White blood cells play an essential role in our health by destroying germs in our bodies and by producing antibodies.
8. Vaccinations trigger our own immune systems to protect us against certain viruses. 9. Genetic illnesses are caused by faulty genes. 10. Air and water quality are two environmental factors that have an impact on our health.
11. Our health is directly affected by the food we eat. We need a balanced diet that includes good fats, a variety of vitamins and minerals, and wholegrains. Our diet should be very low in sugar.
12. Teenagers should get at least one hour of aerobic exercise a day to protect both physical and mental health.
13. Cigarette smoke, alcohol and recreational drug use all impact negatively on health. 14. Looking after our mental health is as important as looking after our physical health.
Questions and Exercises K C
Key Concepts Rewrite the following sentences in your copybook and fill in the blanks.
1. The World Health Organisation defines health as ‘a state of complete ____________, _______________ and _______________ wellbeing and not merely the absence of _______________ or _______________.’
2. Micro-organisms are _______________ living things that can only be seen using a _______________.
3. Good bacteria in the human digestive system produce _____________. 4. _______________, _______________ and _______________ are examples of fungi. 5. Fungi feed by _______________ food and cannot make their own food.
