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