Which one correctly describes a vein?
A. Low blood pressure, large lumen, valves present
B. Low blood pressure, small lumen, valves present
C. Low blood pressure, small lumen, valves absent
D. High blood pressure, large lumen, valves absent
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When the ventricles contract, the bicuspid (mitral) valve prevents blood from flowing from the ________.
A. right ventricle to right atrium
B. left ventricle to left atrium
C. left atrium to the right atrium
D. right atrium to the left atrium
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