Resistance
a. is a measure of the hindrance to blood flow through a vessel caused by friction between the moving fluid and stationary vascular walls.
b. is doubled when the radius of the vessel is reduced by one-half.
c. increases sixteen-fold when the radius of the vessel is reduced by one-half.
d. both (a) and (b) above.
e. both (a) and (c) above.
E
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