The subsequent development of lungs as invaginations of the upper gastrointestinal tract can be understood in terms of current terrestrial fish that maintain gas exchange by swallowing air. This ...

The trachea, also called the windpipe, is part of the passageway that supplies air to the lungs. Any prolonged blockage, even for a few minutes, can cause death. The trachea is about 4.5 inches long ...