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We have relaxation of upper esophageal sphincter which is 1st signal for peristalsis in esophagus. Esophagus . Structure. 25- 30 cm long, propels food into the stomach. It is about 40cm from the incisor teeth. We have 3 narrow parts. Upper esophageal sphincter prevents air entering esophagus. Aortic narrowing surrounded by arch of aorta ................
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