12. Assume that the diameter of a biceps muscle is 4 cm A. How long would it take O2 to diffuse from the surface of the muscle to its interior if its diffusion coefficient was equal to that in water, D 1.78 X 10 cm s? B. Each muscle fiber generally contacts several capillaries. If the muscle fiber is 50 μm in diameter, how long would it take O2 to dif- fuse to its interior, given the same diffusion coefficient as in part A?

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EXPERT ANSWER

The time taken by the gas can be calculated by using

t= x​​​​​​2 /2D

Here x is distance travelled and D is diffusion coefficient

Here in this problem they are 4 and 1.78 × 10-5

t = 16 /2(1.78× 10-5)

= 16/ 3.56× 2 ×10-5

= 16/ 7.12×10-5

= 16× 105 / 7.12

= 3.88× 105 seconds