The diagram shows the internal structure of a human lung - Junior Cycle Science - Question h - 2010
Question h
The diagram shows the internal structure of a human lung. There are about 350 million alveoli per lung.
Describe clearly the exchange of gases that occur between th... show full transcript
Worked Solution & Example Answer:The diagram shows the internal structure of a human lung - Junior Cycle Science - Question h - 2010
Step 1
Describe the movement of oxygen (O₂)
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Answer
Oxygen (O₂) from the air in the alveoli diffuses into the bloodstream. This movement occurs because the concentration of oxygen is higher in the alveoli compared to the oxygen level in the blood.
Step 2
Describe the movement of carbon dioxide (CO₂)
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Answer
Carbon dioxide (CO₂) moves in the opposite direction. It diffuses from the bloodstream into the alveoli. This happens because the concentration of carbon dioxide is higher in the blood than in the air of the alveoli.
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