Median cut through head and neck, swallowing
Cross-section of a human head in front a white background. It shows the procedure of swallowing. Cranial bones and the nasal cavities are visible, as well as the spine, oral cavity, trachea, and esophagus. The food (bolus) accidentally gets into the trachea instead of the esophagus, which causes the person to choke or at worst suffocate. First responders should use the Heimlich maneuver.