Linked from
The 14 pages that link to Vascular resistance, each with the reason it gives.
VasoconstrictionRelated: A smaller vessel radius sharply increases resistance to flow.
VasodilationRelated: Widening a vessel generally lowers its resistance to blood flow.
BaroreflexRelated: Changes in vessel constriction alter resistance and therefore arterial pressure.
Blood flowRelated: Resistance determines how much flow a given pressure gradient produces.
HemodynamicsRelated: Resistance determines how much flow a given pressure gradient produces.
Blood circulationRelated: Changes in vessel diameter alter resistance and help regulate blood flow.