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Dear student,
Answer is C) 100.56 m2 which is close to 100 m2. Option is given in mm2 which is wrong it should be given in m2
The total surface area of a sphere is 4πr2. Radius of each alveoli is 0.1mm.
Therefore surface area of a single alveoli is = 4πr2 = 4x 22/7x 0.1 x 0.1 = 0.1257 mm2.
Converting the value into m2 gives 0.1257/106 m2
Now there are 400 million alveoli in each lung, so the surface area of one lung = 0.1257/106 x 400 x 106 = 50.28 m2
There are two lungs in each person, therefore the total respiratory surface of the person will be = 2 x 50.28 = 100.56 m2
Options are given in mm2 which is wrong it should be given in m2.
Regards
Answer is C) 100.56 m2 which is close to 100 m2. Option is given in mm2 which is wrong it should be given in m2
The total surface area of a sphere is 4πr2. Radius of each alveoli is 0.1mm.
Therefore surface area of a single alveoli is = 4πr2 = 4x 22/7x 0.1 x 0.1 = 0.1257 mm2.
Converting the value into m2 gives 0.1257/106 m2
Now there are 400 million alveoli in each lung, so the surface area of one lung = 0.1257/106 x 400 x 106 = 50.28 m2
There are two lungs in each person, therefore the total respiratory surface of the person will be = 2 x 50.28 = 100.56 m2
Options are given in mm2 which is wrong it should be given in m2.
Regards