Oct 5, 2009
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Medical Student
im having a hard time relating blood pressure and vasoconstriction/dilation.

everything in my tpr books on bernoullis equation states that when the area decreases, velocity goes up. and when that happens, pressure of the fluid decreases. and when area increases, velocity decreases and pressure of the fluid increases. this is true first of all right?

secondly, when a blood vessel vasoconstricts, flow velocity of the blood should increase. and i know that blood pressure increases as well. and the opposite goes for when blood vessels vasodilate. is this different from saying that since the area decreases, flow velocity should increase and pressure should decrease? is blood pressure referring to the pressure of the actual blood or the pressure that the blood exerts on the vessel walls. maybe thats where im getting mixed up.

thanks for any input!