The digestive system in Platyhelminthes has only a single opening to the outside of the body that serves as both mouth and anus, and is hence called Incomplete
A complete digestive system has two openings, mouth and anus.
Circulatory system:
Which the blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).
Arteries take blood from the heart.
Veins put it back from body
Capilleries help to connect arteries and veins.
Which the blood is pumped out of the heart and the cells and tissues are directly bathed in it.