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 A)the pulmonary vein. B)the trachea. C)the right atrium. D)the right ventricle.

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Quizplus · Accepted Answer

CO₂ molecule, if exhaled from the nose, will pass through the trachea, then enter the right and left bronchi, followed by bronchioles, and finally the alveoli, where gas exchange occurs. From there, the gas will enter the pulmonary vein and travel to the left side of the heart, but it will not pass through the right atrium and right ventricle as they are part of the pulmonary circuit, which carries deoxygenated blood to the lungs.

If a Molecule of CO2 Released into the Blood in Your

If a Molecule of CO₂ Released into the Blood in Your