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Endoplasmic Reticulum is the organelle responsible for the assembly of proteins. To put it in simpler words, it's function is manufacturing and packaging. Salivary amylase is the enzyme that starts breaking starch into sugars in the mouth. As all enzymes are proteins, ER plays its vital role is the assembly and transport of salivary amylase.

Do you mean the endoplasmic reticulum in exocrine salivary gland cells that produce amylase? Amylase is a protein and therefore to make a large amount of it, as in saliva, the rough endoplasmic reticulum is the protein 'factory'. Any cells that make large amount of protein will feature large numbers of rough ER. 

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