A person has 400 million alveoli per lung with an average radius of 0.

1.	A person has 400 million alveoli per lung with an average radius of 0.1 mm for each alveolus. Considering the alveoli are spherical in shape, the total respiratory surface of that person is closest to (A) 500 mm2 (B) 200 mm2 (C) 100 mm2 (D) 1000 mm2
Answer» Answer: 1000mm² Explanation: In lungs, alveoli are tiny sacs which allow oxygen and carbon dioxide to move between the lungs and bloodstream. Average radius of spherical alveoli is 0.1 mm Total number of Alveoli is 400 × 2 = 800 million (since 400 million alveoli in 1 lung) Surface area of a sphere is 4πr²r² Therefore, total respiratory surface Area = 4πr²r² × 800 million= 1000mmm²m² (approx)

A person has 400 million alveoli per lung with an average radius of 0.1 mm for each alveolus. Considering the alveoli are spherical in shape, the total respiratory surface of that person is closest to (A) 500 mm2 (B) 200 mm2 (C) 100 mm2 (D) 1000 mm2

Answer»

Answer: 1000mm²

Explanation:

In lungs, alveoli are tiny sacs which allow oxygen and carbon dioxide to move between the lungs and bloodstream.

Average radius of spherical alveoli is 0.1 mm

Total number of Alveoli is 400 × 2 = 800 million (since 400 million alveoli in 1 lung)

Surface area of a sphere is 4πr²r²

Therefore, total respiratory surface Area = 4πr²r² × 800 million= 1000mmm²m² (approx)

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A person has 400 million alveoli per lung with an average radius of 0.1 mm for each alveolus. Considering the alveoli are spherical in shape, the total respiratory surface of that person is closest to (A) 500 mm2 (B) 200 mm2 (C) 100 mm2 (D) 1000 mm2

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