Page 22 - 新思维科学学生用书6 样章
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1.2 The respiratory system
Parts of the respiratory nose
system windpipe
The human respiratory system contains these parts: lungs
• two lungs
• air tubes leading from the mouth and nose to
the lungs
• muscles in the chest that allow air to
move in and out of the lungs.
The lungs and breathing diaphragm
muscle
We use our lungs for breathing. We need to breathe
to stay alive. We breathe in and we breathe out.
The lungs are in the chest. They are protected by the ribs.
The lungs are like stretchy sponges that fill up with air.
Activity 1
Investigate breathing
You will need:
a balloon
1 Put your hands on your rib cage.
2 Breathe in. What do you feel?
3 Now breathe out. What do you feel?
4 Breathe in again. Hold the balloon to
your mouth and breathe out.
What happens to the balloon?
What does this show you?
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