SCIENCE
CIRCULATORY SYSTEM
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 Question 
 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
 
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 These have valves that prevent backflow of blood 
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  arteries 
 
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  veins 
 
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  arterioles 
 
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  capillaries 
 
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 Explanation: 
Detailed explanation-1: -Final answer:The valve which prevents back flow of blood in the veins is Semilunar valve .
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