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