# data[].attributes.body
When people breathe out, the volume will decrease because only the internal intercostal muscles contract, the external inter costal muscle and the diaphragm will relax, when the diaphragm relaxes, it will bulge up by pressure from the organs in the abdomen. If the volume inside the thorax causing the pressure inside the thorax will increase. At that time the pressure in the lungs and thorax will above the atmospheric pressures, so air can force out. And the elastic recoil of the alveoli will help the air out of lungs.

# data[].attributes.body
http://cn.bing.com/images/search?view=detailV2&ccid=ByyrSuuS&id=70F60EB39BBE663809957935438143400C45E586&q=chest+breathing&simid=608055851692589434&mode=overlay&first=1&thid=OIP.ByyrSuuSBetSuTaTwTSciwEsDW

# data[].attributes.body
https://cn.bing.com/images/search?view=detailV2&ccid=tnqwk7Fe&id=957EDC6E6280113C179272B762CD4B12B2A8FE63&q=Gas+exchange+system&simid=607998191752578439&selectedindex=6&qpvt=Gas+exchange+system&ajaxhist=0&first=1&thid=OIP.tnqwk7FeF2HPhS4DW8UAEwEsCy

# data[].attributes.body
https://cn.bing.com/images/search?view=detailV2&ccid=CGQylBbf&id=0EFF06325E4A7E761292A5E8D90AE5CFBEE92334&q=Gas+exchange+system&simid=608026830593525332&selectedindex=1&mode=overlay&first=1&thid=OIP.CGQylBbfJNnnmaQsfXqHSgEsDh

# data[].attributes.body
https://cn.bing.com/images/search?view=detailV2&ccid=oDiLR4B3&id=958A6D29111046C7A0FAF6C85961849DF064985F&q=Gas+exchange+system&simid=608006743031875283&selectedIndex=0&ajaxhist=0

# data[].attributes.body
Now I’m in the lungs, the bronchi will divide to from many small bronchioles, after that. I come in to the alveoli. Human body will do the gas exchange in here. It’s here I (oxygen molecules) will be dissolve, then I will through the alveolar wall across the capillary wall into the red blood cells.

# data[].attributes.body
This route start at nose. the hairs and mucus inside the nose can filter the air, removing particles and some pathogens. And the nose can use evaporation of water from the lining to make air more warm and moisten. There also have cilia in human’s nose and throat, they can remove the particles and pathogens which human then swallow. then I will go to trachea.  the food from mouth will go to esophagus. The epiglottis will make sure the food doesn’t come in to the trachea.

# data[].attributes.body
Now! I’m in the trachea, this is a tube connects the throat to the lungs. there are lot of cartilage will prevent the trachea from collapsing as people breathe in when the air pressure decreases. then the trachea will form the left and right bronchi. I think the lungs look like an upside down tree.

# data[].attributes.body
Hi everyone I am a molecule of oxygen,I have a Perfect route that can help me in to human body don't need through the skin or tissue ...