During swallowing, entry of food into the trachea is prevented by the
Correct answer: A. epiglottis
- A. epiglottis
- B. uvula
- C. soft palate
- D. glottis
Explanation
The epiglottis is a flap of cartilage that folds back over the opening of the larynx as the larynx rises during swallowing, so the bolus is directed into the oesophagus behind it. The soft palate closes the passage to the nose at the same moment, which is why it is the tempting alternative. The glottis is the opening itself, not the structure that covers it.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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