Breathing very high concentrations can do what?

• A. Wash oxygen from the lungs and cause rapid unconsciousness within 15 seconds
• B. Cause coughing
• C. Induce sleep
• D. Trigger metallic taste

Answer: (A)

Breathing very high concentrations can rapidly deprive the body of oxygen and lead to quick unconsciousness. When a gas mixture contains little or displaces the air’s oxygen, the alveolar and blood oxygen levels drop suddenly. The brain far from getting enough oxygen, so awareness and motor function fail quickly, often within seconds—around 15 seconds in severe cases. This is different from irritation or taste effects, which are tied to other gases. Coughing comes from irritants, sleep isn’t the immediate result of oxygen deprivation, and a metallic taste points to specific chemicals rather than pure oxygen starvation. So the fastest, most accurate outcome of breathing very high concentrations in this context is rapid unconsciousness due to loss of oxygen.