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The upper esophageal sphincter is responsible for
Option: 1
regulating the opening of oesophagus into the sphincter.
Option: 2
controlling the movement of food from the pharynx into the esophagus.
Option: 3
regulating peristalsis
Option: 4
preventing the reflux acidic contents of gastric juice into the oesophagus
Answers (1)
Passage of Food through the Oesophagus
- The oesophagus conveys the food into the stomach through the peristalsis movement.
- Peristalsis is the series of wave contraction from one end to the other and is meant for pushing the food.
- The upper oesophagal sphincter controls the movement of food from the pharynx into the oesophagus.
- A muscular sphincter called the gastro-oesophageal or cardiac sphincter regulates the opening of the oesophagus into the sphincter.
- It relaxes to let food pass into the stomach, and then contracts to prevent stomach acids from backing up into the oesophagus.
- When the gastro-oesophagal sphincter does not completely close, the stomach’s contents can reflux (that is, back up into the oesophagus), causing heartburn or gastroesophageal reflux disease (GERD).
The upper esophageal sphincter controls the movement of food from the pharynx into the esophagus. Hence, the correct answer is option b.
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