Average Human Lung Capacity Is 6 L,but a Typical Breath

question 59

Multiple Choice

Average human lung capacity is 6 L,but a typical breath is only about 400 ml;inhaled air only directly reaches the bronchi.How does the oxygen get from the bronchi to the alveoli?

• A) It's transported by the blood in the bronchi and delivered to the alveoli.
• B) The next inhalation moves it a little closer-by the ninth or tenth inhalation it has reached the alveoli.
• C) It diffuses down the bronchioles because its concentration in the alveoli is low.
• D) Oxygen molecules are relatively heavy;they simply flow under the influence of gravity down into the alveoli.

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