Solved UPSC CDS/OTA Question
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During swallowing, which muscle action prevents choking?
Step-by-Step Solution
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During swallowing, the larynx elevates and moves forward. This action helps the epiglottis fold down over the glottis (the opening of the trachea), which prevents food or liquid from entering the airway, thereby preventing choking.
Contraction of the diaphragm is involved in breathing, not swallowing.
Relaxation of the epiglottis is incorrect — the epiglottis actively folds down (not relaxes) to cover the airway.
Closure of the vocal cords also helps protect the airway, but it's the elevation of the larynx that triggers the epiglottis to close off the trachea.
So, the elevation of the larynx is the primary action that prevents choking during swallowing.