This would be a crowbar. If you have trouble understand this, just visualize what happens when you pry the lid of a box open with a crowbar. You push one end down, and the other end goes up.
The process will behang in mouth. After that it will go through esophegus. Then it will go to small intenstine. Before going to large intenstine they will take out the needed chemicla substances and then only they will go to large intenstine.
