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biology igcse urgent

This is gas exchange in the lungs.
The inspired amount of oxygen is 21%, but the expired is 16%, why is this?
Wouldn't more of it be diffused into the blood?
Please explain someone.
Original post by simivb
This is gas exchange in the lungs.
The inspired amount of oxygen is 21%, but the expired is 16%, why is this?
Wouldn't more of it be diffused into the blood?
Please explain someone.


hi simivb i hope dis helps you: http://www.bbc.co.uk/schools/gcsebitesize/pe/appliedanatomy/1_anatomy_respiratorysys_rev3.shtml

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