Eli5: How do our lungs output carbon dioxide? 258 viewsJanuary 3, 2024 Question90.61K January 15, 2022 0 Comments Is there an exhaust valve that opens when I breathe out? In: 3 3 Answers ActiveNewestOldest Anonymous Posted January 15, 2022 0 Comments When you breathe in your lungs fill with fresh air with oxygen. As blood flows past your lungs it drops off CO2 and picks up oxygen. So when you exhale you are breathing the CO2 out into the air, making room for another breath of oxygen. You are viewing 1 out of 3 answers, click here to view all answers. Register or Login
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