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1、Passage1and2OverviewoftheDigestiveSystem-translationOverview of the Digestive System Consider for a moment a Big Mac. The purpose in your eating a Big Mac, other than simple hedonism, is to assimilate the nutrients it represents and make them available to build, repair and maintain your o
2、wn tissues, as well as provide energy for studying and occa-sional other pursuits. You may have asked yourself - "Exactly what nutients are present in a Big Mac that I can assimilate?" MacDonald's comes close to full disclosure in this regard, but what they don't tell you is that in order
3、 to take advantage of these nutrients, you have to provide the means to carefully break them down into much smaller molecules that can be imported into blood. Luckily, your digestive system takes care of this very complex process so efficiently that most of the time you don't even need to t
4、hink about it. At its simplest, the digestive system it is a tube running from mouth to anus. This tube is like an assembly line, or more properly, a dissembly line. Its chief goal is to break down huge macromolecules (proteins, fats and starch), which cannot be absorbed intact, into smal
5、ler molecules (amino acids, fatty acids and glucose) that can be absorbed across the wall ofthe tube, and into the circulatory system for dissemination around your body. Consider for a moment a Big Mac. The purpose in your eating a Big Mac, other than simple hedonism, is to assimlate the
6、nutrients it represents and make them available to build, repair and maintain your own tissues, as well as provide energy for studying and occasio-nal other pursuits. The breakdown of foodstuffs like a Big Mac is accomplished through a combination of mechanical and enzymatic processes. To
7、accomplish this breakdown, the digestive tube requires considerable assistance from accessory digestive organs such as the salivary glands, liver and pancreas, which dump their secretions into the tube. The name "accessory" should not be taken to mean di
