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Enzymes and Digestion...

The human digestive system is made of long muscular __________ with associated
__________. The glands produce _______________ that break down large
_______________ into smaller ones ready for _______________.

The main parts of the Digestive System...

The Salivary Glands pass their secretions onto the food. These secretions contain…

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Diagram showing the main parts in the Digestive System...

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Digestion has two main parts...
o ...physical breakdown...
o ...and chemical digestion.

Physical Breakdown

This is when the food is broken down by _______________ (such as the teeth.) This makes it
easier for the system to digest the food, and also provides a __________ surface area for the
digestion. Food…

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An individual unit (or molecule) is called a _______________. Carbon atoms can join to
form longer chains of these repeating units (or molecules). These are called
_______________. _______________, and _______________ are often polymers.

In Carbohydrates, the basic monomer unit is a __________, which can also be called a

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When combined in pairs, monosaccharides can form disaccharides.
For example...

o Glucose linked to glucose forms _______________
o Glucose linked to fructose forms _______________
o Glucose linked to galactose forms _______________

When monosaccharides join, it is a condensation reaction, therefore a molecule of __________
is lost. The bond fromes…

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2. __________________________________________________________________

3. __________________________________________________________________


Polysaccharides are _______________ formed by combining many _______________
molecules. These molecules are joined by a _______________ bond that were formed by a
_______________ reaction.
Polysaccharides are large, and _______________ molecules. They are suitable for use as
storage molecules. __________ is a polysaccharide…

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Starch Digestion

Enzymes are _______________, therefore it usually takes more than one enzymes to
completely break down a large _______________. Typically one enzyme breaks down the
molecule into smaller _______________, and then __________ enzymes break these down
further into their monomers. These enzymes are usually produces in _______________ parts of…

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Disaccharide Digestion...

_______________ must be physically broken down by the teeth in order to release it. It
passes through the _______________ and into the _______________, whose epithelial lining
produces the enzyme _______________.
Sucrase _______________ the single _______________ bond in the sucrose molecule to
produce the two _______________ that make up…



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