Question
Give the structure of a trachea.

Answer

Structure of Trachea: It is a long thin air tube about 11 cm long and 2.5 cm broad. Its wall is semi-transparent and composed of 4 layers-
  1. Mucosa
  2. Submucosa
  3. Cartilaginous layer
  4. Adventitia
The trachea in the thoracic region bifurcates into two short tubes called primary bronchi which enters into the lungs.

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