Which statement best describes the function of arteries, veins, and capillaries in the circulatory system? a. arteries generally carry oxygen-rich blood away from the heart; veins generally carry oxygen-depleted blood back to the heart; capillaries deliver blood to individual cells. b. arteries carry oxygen-rich blood to the heart; veins carry oxygen-depleted blood away from the heart; capillaries deliver blood to individual cells. c. arteries carry oxygen-rich blood to the heart; capillaries carry oxygen-depleted blood away from the heart; veins deliver blood to individual cells. d. arteries deliver blood to individual cells; capillaries carry oxygen-rich blood to the heart; veins carry oxygen-depleted blood away from the heart.