Biology: blood pressure

[Psyched101]

Hi all,
About factors that influence blood pressure, does vasodilation or vasoconstriction increase bp? Vasodilation increases blood flow but vasoconstriction increases resistance also increasing blood pressure. So which is it?
Thanks!

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[sillyjoe]

Hi all,
About factors that influence blood pressure, does vasodilation or vasoconstriction increase bp? Vasodilation increases blood flow but vasoconstriction increases resistance also increasing blood pressure. So which is it?
Thanks!

Depends where the vasoconstriction or vasodilation is. Think about stepping on the middle of a hose, the pressure increases before your foot and decreases after your foot.