Passage of a bolus through the oesophagus into the stomach is facilliated by which of the following?
(a) peristaltic acitvity of the esophageal muscularis externa
(b) peristaltic activity of the gastric muscularis mucosae
(c) reflux through the pahryngo eosophagal sphincter
(d) smooth muscle in the eosophagal muscularis mucosae
(e) refluc through the gastroeosophagal sphincter
Ans: (a) peristaltic acitvity of the esophageal muscularis externa
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