An adult human has approximately $5\,d{m^3}$ of blood, which circulates about once a minute.
$100\,c{m^3}$ of arterial blood carries $19\,c{m^3}$ of oxygen. $5\,c{m^3}$ of venous blood carries $12.5\,c{m^3}$ of oxygen.
What is the approximate volume in $c{m^3}$ of oxygen taken up per minute in the lungs?
1 )
32.5
2 )
65
325
4 )
950
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