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Blood moving through veins can only flow in one direction because of the vein's _____.

valves
pressure
contraction
restrictions

User Xu Yin
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2 Answers

5 votes

Answer:

valves

Step-by-step explanation:

They act like doorways

User Eric Niebler
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2 votes
valves , they let the blood flow in one direction only . 
User Tam Bui
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