Laminar flow versus turbulent flow

- Laminar flow is streamlined (in a straight line); turbulent flow is not. -Reynold's number predicts whether blood flow will be laminar or turbulent.

- When Reynold's number is increased, there is a greater tendency for turbulence, which causes audible vibrations called bruits. Reynold's number (and therefore turbulence) is increased by the following factors:

a. 1 blood viscosity (e.g., 1 hematocrit, anemia)

b. t blood velocity (e.g., narrowing of a vessel)

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