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The total surface area of alveoli in the lungs can be estimated using the formula for the surface area of a sphere, as alveoli are roughly spherical in shape. The average diameter of an alveolus is about 0.2 mm, leading to an approximate radius of 0.1 mm (0.0001 m). Given that there are around 300 million alveoli in the lungs, the total surface area can be calculated using the formula ( A = 4\pi r^2 ) for one alveolus, and then multiplying by the total number of alveoli. This results in a total surface area of approximately 70 square meters, providing a large area for gas exchange.

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1w ago

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