1.

The walls of the food pipe secrets slipperysubstance called​

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Answer:

mucin

Saliva moistens and lubricates the food, with the aid of a SLIPPERY substance called mucin, making SWALLOWING easier as WELL as dissolving some of the food and allowing it to be tasted. The presence of a digestive ENZYME, known as amylase, in saliva allows chemical DIGESTION of starches to begin.



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