Which of the following statements most accurately captures a principle of blood flow?
A)
With constant pressure, a small increase in vessel radius results in an exponential increase in blood flow.
B)
Blood flow is primarily determined by blood viscosity and temperature.
C)
Blood flows most quickly in the small diameter peripheral capillaries.
D)
Smaller cross-sectional vessel area is associated with lower flow velocity.
Ans:
A
Feedback:
Doubling the radius of a vessel is associated with a fourth-power increase in flow, provided pressure remains constant. Blood flow is primarily a function of blood pressure, resistance, and viscosity. The small size of capillaries is associated with quite slow velocity, given their large total combined cross-sectional area. Smaller cross-sectional area is associated with greater velocity.
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