Obstructive sleep apnea (OSA) is defined by repeated episodes of upper airway collapse during sleep. Which structure most commonly collapses to cause OSA?

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Multiple choice — select the best answer

ATrachea
BHard palate
CSoft palate and posterior tongue base
DEpiglottis only

✓ Correct answer: C. Soft palate and posterior tongue base In OSA, the pharyngeal soft tissues—particularly the soft palate, uvula, and posterior tongue base—collapse against the posterior pharyngeal wall, obstructing airflow. The trachea and hard palate are rigid and do not collapse.

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Topic: Sleep Disorders

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Obstructive sleep apnea (OSA) is defined by repeated episodes of upper airway collapse during sleep. Which structure most commonly collapses to cause OSA?

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