Grades 3–5 · Organisms
How does swallowed food find the right tube?
Behind your mouth, food and air share part of the throat before taking different routes. Swallowed food needs the esophagus, the tube toward the stomach. Air normally enters the larynx, or voice box, and continues through the windpipe toward the lungs. A swallow must guide a mouthful past the airway entrance.
In the diagramFood travels behind the airwaySide cutaway: front ← → backMouthAirwayFood tubeEsophagusEpiglottisAirway entrance is briefly protectedSeveral coordinated actions protect the airway.
Your tongue starts by pushing the mouthful backward. A coordinated series of muscle movements then takes over. The airway closes briefly, and the larynx moves upward. The epiglottis, a flap of tissue, folds over the entrance as part of this protection. Several movements cooperate; the flap is not the only thing keeping food out.
Food enters the esophagus behind the airway. Squeezing waves in the esophagus move it onward toward the stomach. This is another job: protecting the crossing in the throat and moving food along the food tube use different coordinated movements.
After the throat part of the swallow, the airway opens again so breathing can resume. What feels like one quick swallow joins guidance, brief protection and onward transport. Food and air can use a shared region because those movements change which route is available at the right moment.
About this explanation
Starting knowledge: Know that food goes toward the stomach and air goes toward the lungs.
Sources
- NIDDK — Your Digestive System & How it Works
- OpenStax — The Mouth, Pharynx, and Esophagus