KVPY SX SB Exam 2015 Question Paper

Question : 114 of 120

Marks: +1, -0

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

500 mm $^{2}$
200 mm $^{2}$
100 mm $^{2}$
1000 mm $^{2}$

Validate

Solution:

Radius of spherical alveoli = 0.1 mm
Total No. of Alveoli = 400 × 2 = 800 million
Surface area of sphere

= 4πR^ 2

Total respiratory surface Area

= 4πR^ 2 × 800

million
= 1000 mm

^{2}

(approx)

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