Laminar flow is achieved through ______.

Laminar flow is achieved through ______.

• A. Blood Viscosity Reduction
• B. Vasoconstriction
• C. Turbulent Mixing
• D. Vasodilation

Answer: (D)

Laminar flow is smooth and layered, which happens when viscous forces dominate and the Reynolds number is low. In blood vessels, reducing the factors that raise Reynolds number—such as velocity or diameter—helps maintain this orderly flow. Narrowing the vessel through vasoconstriction lowers the local diameter, which lowers the Reynolds number and promotes laminar, non-turbulent flow. Conversely, dilation increases diameter and tends to raise Reynolds number, increasing the chance of turbulent mixing. So the mechanism that best achieves laminar flow here is vasoconstriction.

Laminar flow is smooth and layered, which happens when viscous forces dominate and the Reynolds number is low. In blood vessels, reducing the factors that raise Reynolds number—such as velocity or diameter—helps maintain this orderly flow. Narrowing the vessel through vasoconstriction lowers the local diameter, which lowers the Reynolds number and promotes laminar, non-turbulent flow. Conversely, dilation increases diameter and tends to raise Reynolds number, increasing the chance of turbulent mixing. So the mechanism that best achieves laminar flow here is vasoconstriction.