Which organ blocks breath?

• A. Tongue
• B. Lungs
• C. Esophagus
• D. Trachea

Answer: (A)

Breathing can be blocked when the airway is obstructed. The tongue is a muscular organ at the back of the mouth, and if it relaxes or falls backward—something that can happen when someone is unconscious or very sleepy—it can press against the throat and narrow or close the passage to the lungs. That placement makes it a common cause of airway blockage in everyday scenarios.

The lungs themselves are the organs used for taking in air and exchanging gases, not blocking breath. The esophagus runs behind the airway and handles food and liquids, so it doesn’t normally block breathing. The trachea is the actual airway through which air travels to the lungs, so a blockage there would stop breathing as well, but in this context the typical obstructing organ discussed is the tongue.