Which structure closes over the laryngeal opening during swallowing to help prevent food entering the trachea?
Correct answer: B. Epiglottis
- A. Uvula
- B. Epiglottis
- C. Soft palate
- D. Vocal cord
Explanation
The epiglottis folds downward over the laryngeal opening during swallowing. The uvula mainly helps close the nasopharynx, while the vocal cords are involved mainly in phonation and airway protection.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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