The trachea - is an organ that has a length of 10-12 cm and a diameter of about 1.5-2 cm. Its walls have cartilaginous half-rings that do not allow

Trachea

The trachea — is an organ that has a length of 10-12 cm and a diameter of about 1.5-2 cm. Its walls have cartilaginous half-rings that do not allow subsiding, and help free flowing of the air. At the same time soft muscular rear wall does not prevent the passage of food through the esophagus, which is adjacent to the back of the trachea.

Trachea begins with the larynx; it goes into the chest cavity, which is divided into two main bronchi — the right and left, which go to the corresponding lung. The right bronchus is divided into three branches, and the left — in two ones. In lungs branches ramify repeatedly, forming the bronchial tree. The finest bronchial tubes are called bronchioles.

They end with the pulmonary sacs whose walls are formed by pulmonary vesicles, or alveoli. Taken from http://worldofschool.org

The bronchi have the cartilage in their walls, so they never subside. They are not only the pneumatic tubes, but also perform a protective function. Secretory epithelial cells produce mucus, which is settled with dust particles and contains macrophages that catch and digest various microorganisms.

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Questions:
  • Describe the relationship of the trachea and bronchistructure and functions.