A. Narrow lumen
B. Valves to control direction of flow of blood towards the heart
C. Strong muscular walls
D. Valves to control direction of flow of blood opposite to the heart
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A. Narrow lumen
B. Valves to control direction of flow of blood towards the heart
C. Strong muscular walls
D. Valves to control direction of flow of blood opposite to the heart
B. Valves to control direction of flow of blood towards the heart A vein differs from an artery in having valves to control direction of flow of blood towards the heart.
B. Valves to control direction of flow of blood towards the heart
A vein differs from an artery in having valves to control direction of flow of blood towards the heart.
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