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SlideshowReport

One-way valves.

Description
(a) In some veins, one-way valves assist the return of blood to the heart against the force of gravity. Valves are typically present in the limbs, as shown in this light micrograph of a leg vein with a closed valve directed towards the heart. (b) Comparison of what would happen to blood flow through a vein with and without valves.
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