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scoliendo OP t1_ituc714 wrote

Reply to comment by auraseer in How does vasoconstriction reduce blood pressure in haemostasis? by scoliendo

So as I hypothesised, the vasoconstriction is occurring proximally to the injury in order to reduce blood flow and hence blood pressure at the site of the injury. Thank you! I just wish my texts had made this more clear - they all state it as though the vasoconstriction is happening AT THE INJURY SITE.

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auraseer t1_itud5ph wrote

Now that you understand that part, I'll admit I was oversimplifying slightly.

Vasoconstriction is happening all around the region of injury. It's not really affecting just that big artery in the wrist. It's affecting all the little arteries and arterioles near the wound.

Constriction proximal to the injury will reduce blood flow to it, no matter how far proximal. It will work even if it's just happening in the arterioles a few centimeters or millimeters away from the injury.

That's what they mean by "at the injury site."

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