A plant's circulatory system is the plant's way for it to receive carbon dioxide and nutrients to every cell in its system. It is also the way for a plant to get rid of toxins and waste from its system as well. In a plant's circulatory system, the nutrients a plant needs to survive goes up from the roots to the rest of it's system, as well as the toxins and waste as it is taken out from its sides located above the ground.