When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.
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Transcript of When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.
![Page 1: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/1.jpg)
BREATHING IN
![Page 2: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/2.jpg)
When you breathe in, air enters your lungs.
![Page 3: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/3.jpg)
Inside the lungs are many tiny air sacs called alveoli.
![Page 4: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/4.jpg)
Inside the lungs are many tiny air sacs called alveoli.
![Page 5: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/5.jpg)
Alveoli provide a large surface area for gas exchange.
![Page 6: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/6.jpg)
Alveoli provide a large surface area for gas exchange.
![Page 7: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/7.jpg)
Alveoli provide a large surface area for gas exchange.
![Page 8: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/8.jpg)
Alveoli provide a large surface area for gas exchange.
![Page 9: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/9.jpg)
Alveoli provide a large surface area for gas exchange.
![Page 10: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/10.jpg)
Alveoli provide a large surface area for gas exchange.
![Page 11: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/11.jpg)
Because it is all folded up, an alveolus can have a large surface area but still be very small.
![Page 12: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/12.jpg)
Because it is all folded up, an alveolus can have a large surface area but still be very small.
![Page 13: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/13.jpg)
Because it is all folded up, an alveolus can have a large surface area but still be very small.
![Page 14: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/14.jpg)
Because it is all folded up, an alveolus can have a large surface area but still be very small.
![Page 15: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/15.jpg)
Because it is all folded up, an alveolus can have a large surface area but still be very small.
![Page 16: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/16.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 17: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/17.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 18: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/18.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 19: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/19.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 20: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/20.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 21: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/21.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 22: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/22.jpg)
Your lungs contain 300 million alveoli. If these could be spread out flat...
![Page 23: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/23.jpg)
... they would cover a tennis court!
![Page 24: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/24.jpg)
... they would cover a tennis court!
![Page 25: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/25.jpg)
GAS EXCHANGE IN THE LUNGS
![Page 26: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/26.jpg)
In the lungs, oxygen moves into the blood and carbon dioxide moves out.
![Page 27: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/27.jpg)
This is called gas exchange.
![Page 28: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/28.jpg)
Inside the lungs are tiny air sacs called alveoli, with walls only one cell thick.
![Page 29: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/29.jpg)
Inside the lungs are tiny air sacs called alveoli, with walls only one cell thick.
![Page 30: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/30.jpg)
Inside the lungs are tiny air sacs called alveoli, with walls only one cell thick.
![Page 31: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/31.jpg)
The alveoli are surrounded by tiny blood vessels that also have very thin walls.
![Page 32: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/32.jpg)
Gases such as oxygen and carbon dioxide are able to pass through these thin walls.
![Page 33: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/33.jpg)
Gases such as oxygen and carbon dioxide are able to pass through these thin walls.
![Page 34: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/34.jpg)
Gases such as oxygen and carbon dioxide are able to pass through these thin walls.
![Page 35: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/35.jpg)
Carbon dioxide diffuses from the blood into the alveoli.
![Page 36: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/36.jpg)
Carbon dioxide diffuses from the blood into the alveoli.
![Page 37: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/37.jpg)
Oxygen diffuses out of the alveoli into the blood.
![Page 38: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/38.jpg)
Oxygen diffuses out of the alveoli into the blood.
![Page 39: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/39.jpg)
Blood vessels carry oxygen to all the cells in the body.
![Page 40: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/40.jpg)
In your body, cells take oxygen out of the blood...
![Page 41: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/41.jpg)
In your body, cells take oxygen out of the blood...
![Page 42: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/42.jpg)
In your body, cells take oxygen out of the blood...
![Page 43: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/43.jpg)
... and carbon dioxide moves into the blood.
![Page 44: When you breathe in, air enters your lungs. Inside the lungs are many tiny air sacs called alveoli.](https://reader030.fdocuments.us/reader030/viewer/2022032705/56649db35503460f94aa37a5/html5/thumbnails/44.jpg)
... and carbon dioxide moves into the blood.