What is the primary function of an endotracheal tube during airway management?

• A. Delivers oxygen directly to the bloodstream
• B. Measures airway pressure
• C. Provides access for medication administration via IV
• D. Opens up the airway, isolates trachea from esophagus

Answer: (D)

The endotracheal tube’s main job is to establish and secure a direct airway by passing into the trachea and inflating the cuff to seal it off from the esophagus. This creates a clear path for air to reach the lungs and, crucially, protects the airway from aspiration of stomach contents. With that seal, you can deliver ventilation or oxygen effectively through a bag-valve device or a mechanical ventilator. Oxygen entering the bloodstream comes from gas exchange in the lungs, not directly through the tube itself. The tube doesn’t measure airway pressure, and it isn’t a route for IV medications—those tasks are handled by other equipment and access.