Which of the following is true about veins?
A. Veins carry blood away from the heart, while arteries carry blood to the heart.
B. Veins are more muscular than arteries.
C. Veins have valves; arteries do not.
D. Veins have a smaller diameter lumen than arteries.
Answer:C
Which of the following is true about veins?
A. Veins carry blood away from the heart, while arteries carry blood to the heart. B. Veins are more muscular than arteries. C. Veins have valves; arteries do not. D. Veins have a smaller diameter lumen than arteries.