mucus helps to swallow food easily by lubrication through the food pipe  also known as oesophagus, it takes the food to the stomach where further digestion takes place.
            i hope that this will help u.......^_^
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the importance of mucus is :

1.  the gland in our food pipe produce this product called mucus.

2. this product mucus is a type of lubricant for food so that it would slide easily through our food pipe and reach the stomach easily . 

hope so my answer is useful
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