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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
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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.

User Ayaka Nonaka
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Answer:

they get larger.

Step-by-step explanation:

User IDifferent
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