Which statement best explains CPAP for sleep apnea?

• A. CPAP cures allergy.
• B. CPAP keeps the airway open during sleep.
• C. CPAP lowers blood pressure permanently.
• D. CPAP reduces lung capacity.

Answer: (B)

CPAP keeps the airway open during sleep by delivering a steady flow of air that prevents the throat from collapsing and blocking breathing. By maintaining a clear airway, it reduces apneas and improves oxygen levels and sleep quality. It doesn’t cure allergies, since allergies are an immune response and CPAP doesn’t address that underlying cause. It doesn’t permanently lower blood pressure, though better sleep can help blood pressure over time, and CPAP isn’t a treatment that permanently changes it. It also doesn’t reduce lung capacity; it aids airflow during sleep but doesn’t shrink the lungs.