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Biology, 22.07.2020 05:01 jsully5159
Valves in veins are formed of the tunica media. cause venous blood flow to go in only one direction. are found only in the largest veins. make the use of a skeletal muscle pump unnecessary for venous blood flow. are the leading cause of high blood pressure.
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Valves in veins are formed of the tunica media. cause venous blood flow to go in only one direction....
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