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Biology, 15.10.2019 07:50 taehyungg

Which of the following is true of valves in veins?
a) they are associated with venous sinuses
b) they are most abundant in limbs
c) they contract to propel blood forward
d) they prevent blood pressure in veins from dipping below that of arteries

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Which of the following is true of valves in veins?
a) they are associated with venous sinuses...
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