This is a combination of different set of organs which changes whatever we eat or drink in things that the body uses for growth, energy and repair. The body usually absorbs the nutrients, after the food has been broken down by different chemical processes, the rest is normally expelled as waste product. This whole process can usually take up to several hours or less. The digestive system is also known as the alimentary canal or the gastrointestinal tract. (Tucker L. 2005).
Fig1. shows the human digestive system or the alimentary canal with different organs. (ladyofHats 2006).
LadyofHats( 2006). The digestive system. Available at: https://commons.wikimedia.org/wiki/File:Digestive_system_diagram_edit.svg. (Accessed: 30th of October, 2015).
Digestion of food starts in the mouth or buccal cavity which involves the chemical and mechanical breakdown of food. This involves chewing or mastication of food by our teeth into smaller pieces. The tongue manipulates the already mixed food with saliva into a soft flexible mass known as bolus for easy swallowing. The saliva produced by the salivary glands in our mouth, contains two enzymes, which are responsible for the chemical digestion in our mouth. They are salivary amylase, which breaks down starch, and lingual lipase, which breaks down dietary fat after activation in the stomach because of its acidic nature. The bolus moves to the back of our mouth with help of the tongue into the pharynx. (Tortora G. and Derrickson B. 2006.)
The Salivary Glands:
This gland releases the secretion of saliva into the mouth, it moisturizes the mucus membranes of the pharynx and the mouth and cleanses the teeth as well. Salivary glands are divided into three parts as show...
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...min B &K by breaking down amino acid. These vitamins are absorbed here. The content of the large intestine changes to a semi solid state called faeces due to water re-absorption. (Tortora G. and Derrickson B. 2006).
Fig.7 (Daily Diagram 2015). Diagram of the large intestine. Available at: http://www.dailydiagrams.com/diagramas-de-tv-gratis/. Accessed: 1st of November, 2015).
This is the last part of the large intestine. It is the last 20cm of the alimentary canal (digestive system). It is a muscular tube that retains or eliminate the faeces, whenever the body want to, with the help of two sphincters. The outer sphincter closes the rectum off, and is under voluntary control, while the central nervous system controls the inner one.
This is the region or area where the faeces is egested with the help of the outer sphincter.
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