what is function of bolus

Bolus, food that has been chewed and mixed in the?mouth?with saliva. Chewing helps to reduce food particles to a size readily swallowed; saliva adds digestive?enzymes,?water, and mucus that help chemically to reduce food particles, hydrate them for taste, and lubricate them for easy swallowing.
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Hi Sonu.... 
Food + saliva = bolus
when saliva mixes with the food, it helps in easy swallowing of food. Lysozyme enzyme present in saliva helps in killing microbes and germs. 
Also, a very interesting fact is that 30% of carbohydrate digestion takes place in mouth.
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