Digestive System
The Digestive System breaks down and absorbs nutrients into the blood stream.

The things that make up the digestive system are the mouth, esophagus, stomach, liver, gall bladder, small intestine, pancreas and large intestines.
The esophagus pushes the food and/or liquids into the stomach. Acids in your stomach help dissolve the food and take out nutrients. The nutrients are later put into the bloodstreams. The food that has been digested, from the stomach, goes into the small intestines.
Fluid and enzymes from the liver and pancreas flood the food in the small intestines. Leftovers go into the large intestines were feces (poop) is made.

Usable nutrients go into the bloodstreams. Important molecules pass through walls of the small intestine into the bloodstream. Bloodstreams carry the molecules through the entire body. Blood capillaries get the nutrients.

If we didn’t have a digestive system, then we wouldn’t be able to move, get energy. Then we would need to get nutrients into our cells. If we don’t eat food we would digest our internal organs. Our anus keeps on working no matter what.