How Does the Body Know When It's Low on Oxygen?

How Does the Body Know When It's Low on Oxygen?

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In this video:

That’s not entirely correct, but the human body does care more about carbon dioxide levels, than oxygen levels, something which might be surprising to some given that the purpose of breathing is to provide our bodies with the oxygen it needs to survive. Only the correct amount will do however. Too little when we need it is bad. Too much when we don’t need it can be arguably just as bad.

Want the text version?: http://www.todayifoundout.com/index.php/2013/05/how-your-body-detects-when-its-low-on-or-has-too-much-oxygen/

Sources:

http://emedicine.medscape.com/article/301680-overview#a0104
http://www.cvphysiology.com/Blood%20Pressure/BP014.htm
http://www.ncbi.nlm.nih.gov/pubmed/12609009
https://www.khanacademy.org/science/healthcare-and-medicine/the-lungs/breathing_control/v/peripheral-chemoreceptors
https://www.khanacademy.org/science/healthcare-and-medicine/the-lungs/breathing_control/v/the-respiratory-center
http://www.syncytiabeta.org/~syncyt5/syncytiabeta/index.php?title=Central_Chemoreceptors