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Peristalsis is a coordinated, rhythmic contraction of the muscles in the digestive tract that helps move food along. The organ primarily responsible for this action to push food into the stomach is the esophagus. When food is swallowed, it travels down the esophagus through a series of wave-like muscle contractions that help propel the chewed food, or bolus, toward the stomach. This process is essential for the effective transport of food after ingestion.

The stomach, while it does have muscular contractions, primarily mixes the food and begins the digestive process rather than being involved in the initial transport. The small intestine also uses peristalsis to move food but at a later stage in digestion, after it has already entered the stomach and begun digestion. The liver does not play a direct role in moving food through the digestive tract but instead contributes to digestion by producing bile, which is important for fat emulsification. Thus, the esophagus is the correct answer as it specifically functions to push food into the stomach using peristaltic movements.