Final answer:
The function of the airway adjunct is to keep the tongue from blocking the airway.
Step-by-step explanation:
The function of the airway adjunct is to keep the tongue from blocking the airway. When a person becomes unconscious, their tongue may fall back and obstruct the airway, making it difficult for them to breathe. By using an airway adjunct, such as an oropharyngeal airway or nasopharyngeal airway, the tongue can be pushed aside, allowing air to flow freely into the lungs.