资源简介

(共31张PPT)
Unit 5 Water is life
主题范畴：
人与自然
主题群：
环境保护
子主题：
环境污染及原因，环保意识和行为
Key question
What does water mean to us
Understand the importance of water in the human body;
Recognize the connection between water conservation and environmental protection;
Develop research and critical thinking skills through exploring water-related issues.
Learning objectives 学习目标
At the end of the class, I’ll be able to:
Section 4 Extending and developing competencies | Biological science
Before-learning
Water in the Human Body: Essential Functions
Transport nutrients and oxygen
Water is vital for the human body to function properly, including its role in blood circulation, metabolism, and waste removal (urine).
Regulate body temperature
Remove waste through urine (尿液)
Protect organs and joints
The function of water in urine and hydration.
How does water affect our skin, muscles, and brain
How does water affect our skin, muscles, and brain
Water is important to life. About 55%–60% of the adult human body is water. Let’s find out more facts about water in the human body.
While-learning
The water in our bodies
All living things need water. In fact, water is an important part of all plants and animals. For example, about 95% of the weight of a cucumber is water. For animals, that figure is usually around 60%.
When we are born, about 70%–80% of our body weight is water. This number goes down as we grow up. For an adult man, water makes up about 60% of the body weight. The amount of water is a bit lower for women: around 55%. This is because women usually have more body fat than men.
A lot of water leaves our bodies every day, so we need to replace it. Adults need to drink about 2–3 litres per day to stay healthy. Every time we go to the bathroom, we lose water. Every day, there is around 1.5 litres of water in our urine. If your urine is very yellow, you need to drink more water. The body also loses water to help it cool down. This is called sweat. We lose about 500 ml of water as sweat per day.
It is normal to sweat a lot when we do sport or go out in hot weather. However, if we lose more than 5% of our body weight in water, we will get tired. It is dangerous to lose more than 10%. If that happens, we will feel ill. Remember to bring a water bottle every time you play sport!
What is the main idea of the passage
It mainly introduces the significance of water for living things and water in the human body.
Read para. 1 and answer the question.
All living things need water. In fact, water is an important part of all plants and animals. For example, about 95% of the weight of a cucumber is water. For animals, that figure is usually around 60%.
How much of the weight of a cucumber is water
About 95%.
Read para. 2 and answer the question.
When we are born, about 70%–80% of our body weight is water. This number goes down as we grow up. For an adult man, water makes up about 60% of the body weight. The amount of water is a bit lower for women: around 55%. This is because women usually have more body fat than men.
Why women usually have more body fat than men
Because the amount of water is a bit lower for women.
Read para. 3 and answer the question.
A lot of water leaves our bodies every day, so we need to replace it. Adults need to drink about 2–3 litres per day to stay healthy. Every time we go to the bathroom, we lose water. Every day, there is around 1.5 litres of water in our urine. If your urine is very yellow, you need to drink more water. The body also loses water to help it cool down. This is called sweat. We lose about 500 ml of water as sweat per day.
How much water do we need to drink every day to stay healthy
Adults need to drink about 2–3 litres per day to stay healthy.
Read para. 4 and answer the question.
It is normal to sweat a lot when we do sport or go out in hot weather. However, if we lose more than 5% of our body weight in water, we will get tired. It is dangerous to lose more than 10%. If that happens, we will feel ill. Remember to bring a water bottle every time you play sport!
What will happen if we lose more than 5% of our body weight in water
We will get tired.
Read the article again and complete the notes below.
about 70%-80%
about 60%
about 55%
1.5
0.5
Let’s read!
What else does the body use water for Research the topic and share your findings with the class.
Post-learning
cucumber n. 黄瓜
figure n. 数字
grow up 长大
water makes up about 60% of the body weight
水大约占体重的60%
fat n. 脂肪
replace v. 接替；取代
sweat v. 出汗；流汗
normal adj. 正常的
Complete the sentences!
The __________(cucumber/figure) is a type of vegetable that is green and long.
As we __________(grow up/sweat), our bodies change and we become adults.
The __________(fat/normal) percentage in a healthy diet is very important for our body.
cucumber
grow up
fat
Water __________(makes up/replaces) about 60% of the body weight in adults.
When we play sports, we often __________ (replace/sweat) to cool down our body.
It is __________(normal/fat) to feel tired after exercising for a long time.
A person’s __________(figure/fat) is often measured to check their health.
makes up
sweat
normal
figure
The Importance of Water Beyond Hydration
What else does the body use water for
digesting food
regulating body temperature
transporting nutrients
protecting joints
Group research activity
In small groups, research additional functions of water in the human body. Focus on specific organs or processes, such as the kidneys, skin, or blood circulation.
Water and the Kidneys (肾脏): How water helps filter waste.
Water and Skin Health: Role of hydration in maintaining healthy skin.
Water in the Bloodstream (血液): How water helps maintain blood volume and circulation.
Making a presentation for World Water Day
World Water Day (22 March) is about helping people without access to safe water. In this project, you are going to work in groups and make a presentation on the topic “Water is life” for World Water Day.
Project
Step 1 Collect different facts about water and make a fact sheet.
Step 2 Discuss how important water is in our lives and for society. Find evidence to support your opinions.
Step 3 Discuss the different uses of water, and how we can save water. You may refer to pages 75–76 for help.
Step 4 Organize your ideas in a logical way and give your presentation to the class.
The water in our bodies
All living things need water. In fact, water is an important part of all plants and animals. For example, about 95% of the weight of a cucumber is water. For animals, that figure is usually around 60%.
When we are born, about 70%–80% of our body weight is water. This number goes down as we grow up. For an adult man, water makes up about 60% of the body weight. The amount of water is a bit lower for women: around 55%. This is because women usually have more body fat than men.
Notes
事实上
长大
组成
A lot of water leaves our bodies every day, so we need to replace it. Adults need to drink about 2–3 litres per day to stay healthy. Every time we go to the bathroom, we lose water. Every day, there is around 1.5 litres of water in our urine. If your urine is very yellow, you need to drink more water. The body also loses water to help it cool down. This is called sweat. We lose about 500 ml of water as sweat per day.
It is normal to sweat a lot when we do sport or go out in hot weather. However, if we lose more than 5% of our body weight in water, we will get tired. It is dangerous to lose more than 10%. If that happens, we will feel ill. Remember to bring a water bottle every time you play sport!
降温
变得疲惫
When the well is dry, we learn the worth of water.
— Benjamin Franklin
当井干涸时，我们才明白水的价值。
——本杰明·富兰克林
Wits corner
Thank you!

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