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| Q. |
Secondary esophageal peristalsis: |
| A. | Is preceded by an oral- pharyngeal phase of Swallowing . |
| B. | Involves activation of medullary Swallowing centers . |
| C. | Is accompanied by lower esophageal sphincter relaxation. |
| D. | Occurs in both skeletal and smooth muscle portions of the esophagus. |
| Answer» C. Is accompanied by lower esophageal sphincter relaxation. | |
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