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The answer says pressure decreases with a more narrow pipe. I thought the more narrow the pipe = more often molecules will collide with the pipe, thus increases pressure.
And what about vasoconstriction? When you constrict blood vessels, you decrease the radius (more narrow) but blood pressure increases. How does that work and what's the difference between the two scenarios?
And what about vasoconstriction? When you constrict blood vessels, you decrease the radius (more narrow) but blood pressure increases. How does that work and what's the difference between the two scenarios?