Depiction of a human head in cross-section on a white background, showing the procedure of swallowing. Parts of the chranium and choana are visible, as well as the back bone, oral cavity, trachea and esophagus. Food (bolus) that gets into the trachea instead of the esophagus is shown here. This leads to choking or even suffocation. First responders can execute the Heimlich maneuver.
