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Explain what processes are going on in the picture? What do the numbers 1 and 2 mean?​

Explain what processes are going on in the picture What do the numbers 1 and 2 mean class=

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#1 is CO2 exchange. CO2 is diffusing from the blood into the alveoli for expiration.

#2 is O2 exchange. O2 is diffusing from the alveoli into the blood to be carried to the tissues.
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