Digestive System Essay

629 words - 3 pages

Digestive System

Our digestive system goes through 9 steps in order to complete its process. Digestion happens by passing through more than 22 feet of tubing, being mixed with chemicals from four different glands, being separated between useful and not useful elements. The digestion system has two basics goals, to break down food so far down that it can get into our blood stream and to get rid of what waste is left over.
Digestion starts as soon as food enters the mouth. Our teeth start the process by tearing and crushing the food down so that is small enough to go down our throats. Our salivary gland which is underneath the back of the tongue and creates saliva or spit helps soften food, making it easier to swallow. Saliva is also the first of several chemicals that start to break down foods into simpler forms. The tongue is the muscle that ...view middle of the document...

As the food passes the liver/gall bladder, it makes chemical called bile which breaks down the fat into tiny droplets. The pancreas also adds a digestive chemical that breaks down carbohydrates. With these chemical added food enters the small intestine which is also in the center of the body, under the stomach and is about 22 feet long. The small intestine is where most of the digestive system happens. As the food passes through, it is mixed with new chemicals our "food" is now digested small enough to be put to use by the body.
In the final stages of digestion food is passed through the large intestine. Whatever the body could not use is sent to the large intestine. The big job of the large intestine is to remove water, water that was once needed up until this point. It is no longer needed and is sent into the blood stream. Food spends about twelve hours in the large intestine where it becomes feces and we later get rid of through using the bathroom.
Food becomes less complex at each step of digestion as its nutrients become available to the body. Mechanical digestion includes chewing, mixing of food with saliva by the tongue, churning food in the stomach and segmentation of the intestine. The propulsion is the process that moves food through the alimentary canal, which includes swallowing and peristalsis. Absorption happens when the transport of end products from the GI tract to the blood or lymph. Substances must first enter the mucosal cells by active or passive transport processes. The small intestine is the major part of absorption. Chemical digestion is a catabolic process wherein molecules are broken down to their monomers which are small enough to be absorbed by the GI tract. Begins in the mouth and is essentially complete in the small intestine. Most people don’t usually think about the whole process that is takes to digest food that we are eating but it is a long process from mouth to bathroom.


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