Valves

question 87

Multiple Choice

Valves

• A) are found in veins less than 2 mm in diameter.
• B) consist of folds in the tunica adventitia.
• C) are found more often in the leg veins than in the arm veins.
• D) allow blood to flow only toward the heart.
• E) are found both more often in the leg veins than in the arm veins and allow blood to flow only toward the heart.

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