In an arteriole, if the blood vessel radius is two units and then is vasoconstricted to one unit, what is the result
A)The resistance decreases 16 times.
B)The resistance increases 16 times.
C)Flow will be increased.
D)Flow will be neither increased nor decreased.

Question

Quizplus · Accepted Answer

According to Poiseuille's Law, resistance to flow is inversely proportional to the fourth power of the radius of the blood vessel. Therefore, if the radius decreases from 2 units to 1 unit, the resistance to flow will increase by 16 times. This would result in a decrease in flow through the vessel, as flow is directly proportional to the pressure gradient and inversely proportional to resistance.

In an Arteriole, If the Blood Vessel Radius Is Two