Question

multiple choice question
which statement describes the movement of oxygen during external respiration?
o oxygen diffuses from the blood to the alveoli.
o oxygen diffuses from the alveoli to the blood.
o oxygen moves in the same direction as carbon dioxide.
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Explanation:

External respiration is the exchange of gases between the alveoli and the blood. Oxygen diffuses from an area of higher concentration (alveoli) to an area of lower concentration (blood). Carbon dioxide diffuses in the opposite direction.

Answer:

Oxygen diffuses from the alveoli to the blood.