Question
Mon February 07, 2011 By: Krishna Sowmya

as all we humans takes oxygen and releases carbondioxide,how our noe is able to identify that it is oxygen and this is carbondioxide as air consists of many compositions.how is it possible for human nose to identify the oxygen in air and takes only oxygen not other any gases?

Expert Reply
Tue February 08, 2011
Dear student,
Our nose takes in air as a whole. However, due to differences in partial pressure and affinity of hemoglobin to blood, it is only oxygen that is absorbed by blood, the remaining gases are exhaled out along with carbon dioxide released from blood to the outside.
Regards, TEam Topperlearning
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