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A-Level Biology OCR A

Blood Vasoconstriction Vasodilation Flow Smooth Muscle Arteriole Vessel

Front Describe the processes of vasoconstriction and vasodilation and how this affects blood flow through capillaries.
Back Adjusting blood flow:
  • Vasoconstriction - smooth muscle in arteriole contracts & constricts the vessel preventing blood flowing into a capillary bed
  • Vasodilation - smooth muscle in arteriole relaxes & dilates the vessel allowing blood to flow into the capillary bed again 

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