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Passage 1 and 2
Overview of the Digestive System-translation
Overview 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 own 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'es close to
full disclosure in this regard, but what they don't tell you is that in order 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 plex process so efficiently that most of the time you don't even need to think 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
smaller molecules (amino acids, fatty acids and glucose) that can be absorbed across the wall ofthe tube, and into the circulatory system
for disse
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