Digestive System

I am a tunnel, long and wide, Food travels through me on a ride. I help it reach the stomach below, What am I? Do you know?

I work before food goes down, Inside your mouth, I am found. I make a liquid clear and thin, What am I? Let digestion begin!

I am like a mixing machine, I work behind the scenes. I churn and squash the food you eat, What am I? Can you repeat?

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