Figure 3 - Normal esophageal motility.
From the following article
Richard H. Holloway
GI Motility online (2006)
doi:10.1038/gimo30
Each swallow, as detected by the pharyngeal channel, is followed by a propagated sequence of pressure waves that traverses the entire esophageal body. Lower esophageal sphincter (LES) relaxation occurs with each swallow.
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