Final answer:
The 21-year-old male's Glasgow Coma Scale (GCS) score would be 11 out of a possible 15, taking into account his responses in Eye Opening, Verbal, and Motor categories.
Step-by-step explanation:
The Glasgow Coma Scale (GCS) is used to assess the level of consciousness in a person who has suffered a head injury or is otherwise impaired. The GCS is based on three aspects of responsiveness: Eye Opening (E), Verbal Response (V), and Motor Response (M).
In this scenario, the 21-year-old male opens his eyes in response to the attempted insertion of the nasal airway, which would typically score a 3 on the Eye Opening scale as it's in response to speech (verbally commanded). He is using inappropriate words - which is a 3 on the Verbal Response scale. The patient also exhibits purposeful movement by slapping your hand away; therefore, he would score a 5 on the Motor Response scale. Adding these together (E3 + V3 + M5), his total GCS score would be 11 out of a possible 15.