You have two tubes in your neck. One (the esophagus) is for food and leads to the stomach. The other (the trachea) is for air and leads to the lungs. It’s really bad to send food (or liquid) down the air pipe. It can block that pipe or interfere with the lungs. Fortunately, you have ways of covering and protecting that pipe while there’s food in your mouth to prevent any from accidentally getting in there. The main one is a flap called the epiglottis that covers it when swallowing.
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