How does oxygen exit the bloodstream at its final destination? Why does it move in the direction that it does across the capillary surface?   What cellular organelle is the final destination of O2?  Why?  Be as specific as you can in your answer.  What cellular organelle is the major source of carbon dioxide?  Why?  Be as specific as you can in your answer.

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A:

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A: Answer 

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Q: that

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A:

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