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Help! GAS EXCHANGE Respiratory System

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Question 1.)Alveolar air has a high concentration of oxygen and a low concentration of carbon dioxide. What happens?

Question 2.) Tissue capillaries have a high concentration of o2 and a low concentration of co2. What happens?

I'm taking an online course. Currently studying for a test. These two questions on the study guide I am not understanding. I know that gas exchange occurs through diffusion. Any help would be greatly appreciated. Thanks in advance

You tube has great videos for this type of thing, and along with the explanation you also get a visual. I used it often for studying.