A flap of cartilage that covers the windpipe while swallowing

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Multiple Choice

A flap of cartilage that covers the windpipe while swallowing

Explanation:
Protection of the airway during swallowing hinges on the epiglottis flipping down to cover the tracheal opening as you swallow. This flap of cartilage rises with the larynx and then folds to seal the airway, directing food and liquid into the esophagus instead. Once swallowing finishes, the epiglottis returns to its upright position and breathing resumes. The other structures don’t serve this protective role: alveoli are the gas-exchange sacs in the lungs; the diaphragm is the main muscle of respiration; the mouth is simply the entry for intake but does not shield the windpipe during swallowing.

Protection of the airway during swallowing hinges on the epiglottis flipping down to cover the tracheal opening as you swallow. This flap of cartilage rises with the larynx and then folds to seal the airway, directing food and liquid into the esophagus instead. Once swallowing finishes, the epiglottis returns to its upright position and breathing resumes. The other structures don’t serve this protective role: alveoli are the gas-exchange sacs in the lungs; the diaphragm is the main muscle of respiration; the mouth is simply the entry for intake but does not shield the windpipe during swallowing.

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