The trachea needs to be sturdy but pliable, bone would be too rigid and muscle is too soft to keep it's shape through breathing and swallowing.
The singular for trachea is "trachea". The plural is "tracheae".
Trachea size
the trachea
No trachea is not the lung.
tThe trachea ends at the bronchia which takes air from the trachea to the lungs.
That tube is the trachea.
the trachea (windpipe)
Tracheorrhagia is bleeding from the trachea. Tracheitis is inflammation of the trachea.
Vertebrate trachea: Birds and mammals Invertebrate trachea: Insects and crustaceans
trachea leads to the lungs
Anything that breathes has a trachea.
trachea is the breathing of insects