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Anatomy question?

Which of the descriptions below does not explain the effects of air pollution on the respiratory system?

It could restrict air flow through the bronchi.
It could disrupt the rate of ventilation.
It could prevent hemoglobin from binding to oxygen.
It could increase carbon dioxide uptake in alveolar sacs.

I've narrowed this down to B and C, but I'm still not sure if those are even right. I've been working on this quiz since about 2 AM last night and it's getting on my nerves that this information isn't anywhere in my lessons.

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Kalahira
It could increase carbon dioxide uptake in alveolar sacs Other than this option all the other options are the observed affects that air pollution is known to have on the respiratory system.

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