Carbon dioxide (CO) is transferred from returning blood back into gaseous form in the lungs and exhaled through the lower respiratory tract and then the upper, to complete the process of breathing.
During gas exchange, carbon dioxide goes from the blood into the lungs, so it can be breathed out.
During gas exchange, carbon dioxide goes from the blood into the lungs, so it can be breathed out.
为该句子写一个更简单的版本: Carbon dioxide (CO) is transferred from returning blood back into gaseous form in the lungs and exhaled through the lower respiratory tract and then the upper, to complete the process of breathing. 输出: