Biology for IGCSE & O level - Human Nutrition (Section 5 - No. 3)
Which of the following events occur during swallowing?
The tongue rolls the food into a bolus.
The epiglottis closes the trachea.
Peristalsis begins in the oesophagus.
Saliva is secreted.
Explanation
During swallowing, the tongue forms the bolus, epiglottis closes the trachea, and peristalsis begins in the oesophagus. Saliva is secreted before swallowing.
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