Dictionary » O » Oxygen




(chemistry) A colorless, tasteless, oderless, gaseous element that abounds in the atmosphere.


In chemistry, oxygen is an element with an atomic weight of 15.96. It is capable of combining with all elements, with the exception of fluorine, to form oxides, bases, oxyacid anhydrides, etc. At room temperature, oxygen is only moderately active with most substances. However, at higher temperatures, it becomes very active that it is considered as one of the most powerful chemical agents.

In biology, the oxygen plays a crucial role in various biochemical and physiological processes, such as in cellular respiration. Its presence makes cellular respiration about ten times more efficient in yielding ATP.

Oxygen is also thought to have a therapeutic role especially to treating or managing ischemic tissues.

Word origin: F. Oxygene, from Gr. Sharp, acid _ root of to be born; named by Lavoisier as he supposed it to be a constituent of al 1000 l acids
Related forms: oxygenic (adjective)

Symbol: O

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Best respiratory medium for oxygen?

If air is considered to be better as a respiratory medium than water because (among other reasons) it diffuses better in it (i.e. The air) why is a respiratory surface considered better if it is moist rather than dry (i.e. Covered in an appropriate thin layer of water) ?

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by Titanium27
Sun Mar 15, 2015 8:55 am
Forum: Human Biology
Topic: Best respiratory medium for oxygen?
Replies: 0
Views: 90

Re: Why do Africans have large noses and lips?

... more demanding than when it is cool (because the body needs to spend some energy just for the cooling processes) and thus the body requires more oxygen. Having a wider nose and nostrils facilitates breathing in more air thereby supplying the body with more oxygen and thus giving a survival advantage ...

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by kristi2374
Mon Dec 29, 2014 2:07 am
Forum: Human Biology
Topic: Why do Africans have large noses and lips?
Replies: 35
Views: 253685

Re: Oxygen requirements of eukaryotes

Here is a user's guide for parasites, may have some of your organisms with their oxygen requirement: http://www.ncbi.nlm.nih.gov/pubmed/21320384, Also, I know of Bergey's manual for bacterial taxonomy, you could check if something similar exists for all of the eukaryotic ...

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by Hrushikesh
Sat Dec 13, 2014 2:07 am
Forum: Microbiology
Topic: Oxygen requirements of eukaryotes
Replies: 7
Views: 4468

respiration of human body

... Anyway, to give you an answer: if we worked with an average resting breath of around 350ml of air that reaches the lungs, and 20% of that is oxygen we have around 70ml of oxygen in each breath. 5% of that is used, so approximately 3.5ml of oxygen would be used per breath. On average a human ...

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by BasicBiology
Sun Nov 16, 2014 7:16 pm
Forum: Human Biology
Topic: respiration of human body
Replies: 2
Views: 1007

respiration of human body

The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about ...

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by angel92
Wed Nov 12, 2014 2:52 pm
Forum: Human Biology
Topic: respiration of human body
Replies: 2
Views: 1007
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