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.

That's what I thought, but apparently when a blood vessel is injured, the vessel constricts in order to reduce blood pressure, which is the opposite of my understanding. Hence the question.

So as I theorised, the vasoconstriction is occurring proximal to the injury, rather than at the site of the injury? This makes the most sense to me, which is why I theorised it, I just wish my course materials had explained this!

From what I understand based on this... blood is flowing at standard pressure until it reaches an area of vasoconstriction. Beyond this area is a damaged blood vessel. The constricted vessels allow less blood through per second, thus reducing the blood pressure in areas distal to this vasoconstriction, along the same artery/arteriole network, reducing the pressure on the damaged area. Is this accurate?

So are all capillary beds fed by more than one artery/arteriole network? Or are some capillary beds only fed by one? And if the latter is the case, what happens to that capillary bed when the blood flow is reduced?