How are the circulatory and digestive systems related?

The organs of the digestive system are used to turn ingested food into products that  can be absorbed by the blood and then carried to provide energy to other organs related to the circulatory system such as the heart.

Without the transport of oxygen to the organs of the digestive system and removal of carbon dioxide from their tissues by the circulatory system, the operations of the digestive system would ground to a halt.

So the digestive system makes available products that supply energy to the circulatory system and the circulatory system  brings oxygen vital to the organs of the digestive system and keeps it running and at the same time carries away waste thus maintaining smooth function.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

not: both offer magnification to the atomic level.