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The digestive system GapFill
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Most of the reactions that take place in the body, including those that play a role in digestion, are catalysed by enzymes. Enzymes are made of , and their shape is what allows them to perform their role. They work under very specific conditions, including specific and temperatures. Beyond these ideal conditions, bonds break in the enzymes, stopping them from working.
Enzymes have an , which is the part of the molecule into which substances fit. This part is very specific to a single type of molecule. It is due to this that scientists use the term to describe the model.
Examples of enzymes that work in the digestive system include amylase, protease and . Salivary glands produce the enzyme , which starts the digestion of starch. Digestion is essential for breaking down large molecules, such as those consumed in food. Without this process, large molecules would not be able to be absorbed by the body.
Proteins are broken down by enzymes into , which the body can use to make new proteins. Similarly, complex carbohydrates can be broken down into simple sugars, including , which can be used during respiration. The breakdown of fats is performed by bile and enzymes in coordination, as bile fats to increase the surface area for enzymes to work on.