"The digestive canal represents a tube passing through the entire organism and communicating with the external world, i.e. as it were the external surface of the body, but turned inwards and thus hidden in the organism"

This quote by Ivan Pavlov is referring to the digestion system as well as its function in the body. The digestion canal is a tube that goes through the whole body and also links to the outside world. It resembles the external surface of the body, yet it is transformed inwards as well as hidden within the organism. This tube is responsible for the digestion of food and the absorption of nutrients. It is additionally responsible for the elimination of waste items from the body. The digestion canal is comprised of a number of organs, consisting of the mouth, esophagus, tummy, small intestinal tract, large intestine, and also anus. Each of these organs plays an important function in the digestion process. The digestive canal is an important part of the body and is needed for the appropriate functioning of the body. Without it, the body would certainly not have the ability to take in the nutrients it requires to survive.