How does my digestive system work from mouth to my butt?

See the picture attached to see how digestive system works

I saw you asked a question on why feces is brown here is why : 

Brown is the common color of poop.There is a pigment called bilirubin that is formed when the red blood cells in the liver and bone marrow break down. This ends up in the intestines where the bacteria begins to form and eat which turns the poop brown.