During vasoconstriction, what happens to the lumen?

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Multiple Choice

During vasoconstriction, what happens to the lumen?

Explanation:
When arterioles constrict, the smooth muscle in their walls contracts, making the interior opening (the lumen) smaller. This narrowing increases resistance to blood flow, so flow through that vessel tends to decrease unless the driving pressure rises. Blood viscosity isn’t changed by this process, and vasoconstriction doesn’t increase overall flow. So the lumen size decreases.

When arterioles constrict, the smooth muscle in their walls contracts, making the interior opening (the lumen) smaller. This narrowing increases resistance to blood flow, so flow through that vessel tends to decrease unless the driving pressure rises. Blood viscosity isn’t changed by this process, and vasoconstriction doesn’t increase overall flow. So the lumen size decreases.

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