What happens during external respiration in the lungs? Question 3 options:

Oxygen passes into the blood and carbon dioxide passes out of the blood

Oxygen passes out of the blood and carbon dioxide passes into the blood

Oxygen and carbon dioxide pass into the blood

None of the above

Oxygen passes into the blood and carbon dioxide passes out of the blood.

Explanation:

Respiration is the movement of oxygen from the outside environment (free flowing air) into the cells that from part of lung tissue and the removal of carbon dioxide in the opposite direction (i.e out of the lungs).

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all the above is what i would say