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A-Level Biology OCR A

Valves Blood Flows Describe Function Veins Explain Work

Valves in veins are flaps of the inner lining that prevent the backflow of low-pressure blood by closing when blood attempts to flow backward.

Valves in veins are flaps of the inner lining that prevent the backflow of low-pressure blood by closing when blood attempts to flow backward.

Front Describe the function of valves in veins and explain how they work.
Back Valves in veins:
  • Prevent backflow of low pressure blood
  • Flaps of inner lining of vein
  • When blood flows in direction of the heart, the valves are open so blood can pass thru, if it flows backwards they close

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