Valves

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.