An individual with no respiratory problems lies at rest for an hour. During this period, their breathing is shallow and slow, so only a small amount of air from outside the body reaches the alveoli. The person’s heart rate stays constant. Which statement is correct?
- AThe carbon dioxide concentration in the blood in the pulmonary vein will be higher than in the pulmonary artery.
- BCarbon dioxide molecules in the air of the alveoli move out of the blood by active transport.
- CThe air in the alveoli has a lower concentration of oxygen than the blood in the pulmonary vein.
- DOxygen molecules diffuse from the air in the alveoli into the blood at a slower rate than when the person is active.