how does transport of O2 and CO2 take place in man?

i takes place in lung alveoli
 
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If nature had not allowed the transformation of energy, no matter would have been created from the primordial energy present at the Big Bang. There would therefore have been no Big Bang and the universe would simply not exist.  (0)
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If nature had not allowed the transformation of energy, no matter would have been created from the primordial energy present at the Big Bang. There would therefore have been no Big Bang and the universe would simply not exist.  (0)

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