Vein contains one-way valves that work in conjunction with skeleto-muscles. When the sceleto-mucles contract, the valve open and blood is forced toward the heart. When the sceleto-muscle relaxed, t... | more...

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Channels: Medical

Tags: vein sceleto-muscle valve heart

Upload by: cagatay on 30-05-2009.

Duration: 0m 19s

Dnatube: Sciencific and Medical video site.