Using the appropriate formula, what effect does changing the following vessel diameters have on blood flow?
A. diameter = 8 mm, decreasing to 6 mm
B. diameter = 8 mm, increasing to 12 mm
C. diameter = 10 mm, decreasing to 5 mm
D. diameter = 10 mm, increasing to 20 mm
Flow ?P/R and R 1/r4.
A. Radius changes from 4 to 3, 44 = 256, 3 4 = 81, 256/81 = 3.16, so flow decreases by a factor of 3.16.
B. Flow increases by a factor of 5.06.
C. Flow decreases by a factor of 16.
D. Flow increases by a factor of 16.
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