Solid food is transported as a bolus ("ball") down the first half of the GI tract by the peristaltic movements (contraction and relaxation of the oesophagus in front and behind the bolus). It continues as chyme (thick fluid mass) during the the last half of the GI tract after being liquified in the stomach.
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The mouth chew the food first,a muscle at the back of the mouth forces the food down your gullet and the gullet's muscle forces it down into your stomach.
Food goes down the esophagus by a process called peristalsis. It is a downward squeezing motion.