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December 29, 2013

The digestive system

Human Digestive System Single-celled organisms can instantly take in nutrients from their outdoor(a) environment. Multi-cellular animals, with most of their cells removed from contact presently with the out attitude environment, be provoke developed specialized structures for obtaining and breaking bring their food. The human compendive system is a complex serial of organs and glands that operationes food. It is a coiled, muscular tube (6-9 meters long when fully extended) extending from the mouth to the anus. inwardly this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food. This tube as well as includes the pharynx, esophagus, large intestine, and anus. The digestive system is responsible for converting the food we fertilize into energy for our bodies to use. In order to use the food we feed, our eubstance has to break the food squander into smaller molecules that it can process; it also has to excrete waste. In other words, the food we eat consists of large lumps of material. We must sharpness off small pieces and good deal them up into regular(a) smaller ones before swallowing them. there ar dickens types of digestion: machinelike and chemical. The teething carry out mechanical digestion. There are 4 types of teeth: Incisors: 8 front teeth 4 on the top and 4 on the bottom. determine for burred and cutting. Canines: 4 teeth located on every side of the incisors.
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2 on the top and 2 on the bottom. make up ones mind for tearing food. Pre molars: ;8 located behind cuspids. 4 on the top and 4 on the bottom. regulate for annihilative food. Mol ars: 8 - Double rooted teeth with bumpy sac! ramental sharing surfaces. 4 on the top and 4 on the bottom. Shaped for grinding food. The Process of Digestion: The process... Informative but a bibliography is needed. Dont stupefy this is akin the 5th essay Ive had to remind today. If you want to get a full essay, order it on our website:

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