Applying the principles of Poiseuille's law, which statement is true?
a. The resistance offered by a tube is in-versely proportional to its length.
b. As the radius of a tube decreases, the pressure gradient increases.
c. The more viscous the fluid, the easier it is to move the fluid through a tube.
d. The driving pressure of a gas is indirectly proportional with the length of the tube.
ANS: B
Poiseuille's law can be rewritten as: ?P = Q ? [(8nl)/(?r4)]. According to this equation, the fol-lowing statements can be made. The more viscous a fluid, the greater the pressure gradient re-quired to cause it to move through a given tube. The resistance offered by a tube is directly pro-portional to its length. The pressure required to achieve a given flow through a tube must increase in direct proportion to the length of the tube. The resistance to flow is inversely proportional to the fourth power of the radius. Small changes in the radius of a tube will cause profound in-creases in the resistance to flow through that tube.
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