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AQA GCSE Science & Additional Science Biology 1 Topic 1 Hodder Education Revision Lessons Keeping healthy Click to continue.

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Presentation on theme: "AQA GCSE Science & Additional Science Biology 1 Topic 1 Hodder Education Revision Lessons Keeping healthy Click to continue."— Presentation transcript:

1 AQA GCSE Science & Additional Science Biology 1 Topic 1 Hodder Education Revision Lessons Keeping healthy Click to continue

2 AQA GCSE Science & Additional Science Biology 1 Topic 1 Overview A combination of a balanced diet and regular exercise is needed to help keep the body healthy. Our bodies provide an excellent environment for many microbes. Microbes can make us ill once they are inside us. Our bodies need to stop most microbes getting in, and be able to deal with any microbes that do get in. Infection can be prevented with vaccination. Click to continue

3 AQA GCSE Science & Additional Science Biology 1 Topic 1 Diet and exercise 1 A healthy diet contains the right balance of the different foods we need and the right amount of energy. A person is malnourished if their diet is not balanced and they take in more or less energy or fewer nutrients in food than they need. This can lead to being overweight, underweight or having deficiency diseases. Click to continue

4 AQA GCSE Science & Additional Science Biology 1 Topic 1 Diet and exercise 2 What food types are shown in these pictures? Click to continue

5 AQA GCSE Science & Additional Science Biology 1 Topic 1 Diet and exercise 3 For a balanced diet we need: Click to continue carbohydrates, fats and proteins for energy and to build cells mineral ions and vitamins to stay healthy What have you eaten today? Is it balanced?

6 AQA GCSE Science & Additional Science Biology 1 Topic 1 Metabolic rate Metabolic rate is the rate at which all the chemical reactions in the cells takes place. Metabolic rate is affected by: Click to continue how active the person is the physical fitness of the person the proportion of muscle to fat in the body inherited factors can also play a part A low metabolic rate means weight gain is more likely. Do you have a high metabolic rate?

7 AQA GCSE Science & Additional Science Biology 1 Topic 1 Inherited factors and health 1 Factors inherited from parents have a part to play in health. These can be: Click to continue genetic diseases metabolic rate cholesterol levels What others are there?

8 AQA GCSE Science & Additional Science Biology 1 Topic 1 Inherited factors and health 2 Cholesterol is a fatty substance made by the body. It is essential for health. Animal fats contain high quantities of cholesterol. If we eat too much of foods containing animal fats, the levels of cholesterol in our blood increase. Cholesterol can leave deposits in blood vessels, causing them to narrow and potentially causing heart attacks. How can we reduce our cholesterol levels? Click to continue

9 AQA GCSE Science & Additional Science Biology 1 Topic 1 Inherited factors and health 3 Some inherited or genetic diseases are: cystic fibrosis sickle-cell disease haemophilia What are the symptoms of these diseases? Click to continue

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