What route does carbon dioxide follow as it leaves the body?

P u l m o n a r y v e i n \to a l v e o l u s \to b r o n c h u s \to b r o n c h i o l e

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P u l m o n a r y a r t e r y \to a l v e o l u s \to b r o n c h u s \to b r o n c h i o l e

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P u l m o n a r y v e i n \to a l v e o l u s \to b r o n c h i o l e \to b r o n c h u s

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P u l m o n a r y a r t e r y \to a l v e o l u s \to b r o n c h i o l e \to b r o n c h u s

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Solution

The correct option is C $P u l m o n a r y v e i n \to a l v e o l u s \to b r o n c h i o l e \to b r o n c h u s$
The carbon dioxide carrying blood is taken from the heart to the lungs by the pulmonary artery.
The exchange of gases takes place in the alveolus.
The CO $_{2}$ released from the alveoli moves from the alveolus to the bronchiole and then to the bronchus.
So, the correct option is 'Pulmonary artery→alveolus→bronchiole→bronchus'

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Carbon dioxide moves out of blood and into the alveolus while oxygen moves into the blood from the alveolus. Why does it happen so?

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