In contrast to Secondary esophageal peristalsis,primary esophageal peristalsis characterized by which of the following statements?

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Primary esophageal peristalsis is initiated by swallowing and involves an oropharyngeal phase, where the process starts from the oropharynx and moves down the esophagus, coordinating with the relaxation of the lower esophageal sphincter to allow food to enter the stomach. This is in contrast to secondary peristalsis, which is initiated by the distension of the esophagus itself and does not have an oropharyngeal phase.

In Contrast to Secondary Esophageal Peristalsis,primary Esophageal Peristalsis Characterized by Which