# data[].attributes.body
https://image.baidu.com/search/detail?ct=503316480&z=&tn=baiduimagedetail&ipn=d&word=呼吸&step_word=&ie=utf-8&in=&cl=2&lm=-1&st=-1&cs=569998924,2068964032&os=3902039459,3682486426&simid=3419441757,327826091&pn=5&rn=1&di=11692206680&ln=1772&fr=&fmq=1490267894303_R&ic=0&s=undefined&se=&sme=&tab=0&width=&height=&face=undefined&is=0,0&istype=2&ist=&jit=&bdtype=0&spn=0&pi=0&gsm=0&objurl=http%3A%2F%2Fphotocdn.sohu.com%2F20160103%2Fmp51868571_1451755393332_2.jpeg&rpstart=0&rpnum=0&adpicid=0

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http://cn.bing.com/images/search?view=detailV2&ccid=vzrIXTHX&id=53DA3AE527903D3296C2C8EB1B7F30276373D6A6&q=human+lungs&simid=607999785180990839&selectedIndex=3&qpvt=human+lungs

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Max Gao

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In the lungs, oxygen and carbon dioxide in the bronchial end of alveoli exchange. The alveoli is surrounded by capillaries. When a person inhales, oxygen moves from the alveoli to the surrounding capillaries and into the blood vessel. At the same time, carbon dioxide flows from the blood to the capillaries and into the alveoli. When people exhale, carbon dioxide is discharged from the lungs.

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The process of expiration is opposite with inspiration

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When air enter into throax, intercostal muscle, rib and diaphragm start moving. Intercostal muscle and rib relax, then diaphragm contract moves down and air will go into lungs makes lungs bigger.

Inside the trachea, bronchi and bronchioles there are ciliated cell and goblet cell,
these two kinds of cells can trap pathogen and dust.

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The air go into nose or mouth ,then the hair in nose will filter the air.

Then air will pass through larynx.

Then air will pass through trachea, and trachea's function is to connect throat and lungs.

Then air will pass bronchi, and branches trachea into two bronchus connect to two lung.

Then air will pass bronchiole at its end is alveoli and there are plenty of it.

Alveoli connect with blood vessel and it will  sent oxygen into blood.

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When we breath out intercostal muscle will contract and diaphragm will relax moves up to help carbon dioxide go out.
Lungs will become smaller,
push the carbon dioxide and water out.

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Describe what happens when ventilation occurs in human

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Describe what happens when ventilation occurs in human

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-during inspiration at least 4 steps
-during expiration at least 4 steps

use your own words
explain in a series of numbered steps pictures of lungs(with reference)

using key words correctly
5key words 5
7key words 7
10key words 7