How do the numerous tiny air sacs in our lungs help us breathe more efficiently?
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Worked Solution
Step 1: Air sacs (alveoli) are where oxygen enters the blood and CO2 leaves it.
Step 2: Having millions of tiny sacs provides a massive total surface area.
Step 3: More surface area allows more gas molecules to cross at the same time.
Correct answer: They increase the surface area for faster gas exchange.
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