Subject: How much oxygen do my lungs absorb?

Date: Wed Jan 7 12:58:47 1998
Posted by Bill Cowie
Grade level: nonaligned
School: No school entered.
City: Reading State/Province: MA
Country: USA
Area of science: Medicine
ID: 884199527.Me

How much of the oxygen in the air that I breathe in is absorbed by
my lungs?  If the air I breathe in contains 19% oxygen, what is
the composition of the air I exhale?
Also, I am a runner, and as I get into shape, I can run faster and
faster.  Is this because my lungs are taking more oxygen out
of the air I breathe?  Or is it because I am able to breathe in 
more air per breath?  Or more breaths per minute?  Or 
are my leg muscles able to do more work with the
same amount of oxygen?

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