If a molecule of CO2 released into the blood in your left toe is exhaled from your nose, it must pass through all of the following except

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The pulmonary vein carries oxygenated blood from the lungs to the left atrium of the heart, not deoxygenated blood containing CO2. CO2 travels from the right atrium to the right ventricle, then to the lungs via the pulmonary artery, and is exhaled through the alveoli and trachea.

If a Molecule of CO2 Released into the Blood in Your