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Arteriolar Resistance and Blood Pressure

What determines blood pressure? Pressure is the force exerted by a gas or liquid. Pressure depends on the volume of the space involved, the number of molecules inside the space, and the kinetic energy (temperature) of those molecules. Blood pressure will increase if the blood vessels constrict, thus decreasing the volume. Blood pressure will also increase if the rate of at which the blood is pumped is increased, thus increasing the amount of blood in a given space.

View the animation below, then complete the quiz to test your knowledge of the concept.






1When arterial outflow becomes greater than inflow...
A)arterial pressure increases.
B)arterial pressure decreases.
C)arterial pressure reaches a steady state.
D)arterial pressure oscillates.



2Initially, as arteriole outflow increases...
A)arterial pressure increases.
B)arterial pressure decreases.
C)arterial pressure reaches a steady state.
D)arterial pressure oscillates.



3Eventually, after the arteriole outflow has remained at an increased level...
A)arterial pressure increases.
B)arterial pressure decreases.
C)arterial pressure reaches a steady state.
D)arterial pressure oscillates.



4If given the choice between traveling through a vessel with high resistance and one of low resistance, blood will travel through the vessel of most resistance.
A)True
B)False



5After dilation of an arteriole, the arterial blood pressure returns to the level that it was before the dilation.
A)True
B)False







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