respiratory organs

Lungs

The left and right bronchi enter each lung, where they continue to go into secondary bronchi. In turn, these bronchi will divide into smaller and smaller. then eventally when the diamiter of the air passageway becomes less than 1mm, there called bronchioles. the smallest of the bronchi, with the diameter of less than 0.5mm, are the terminal bronchioles.

The transitoin from the terminal to the respiratory bronchioles marks the transitoin between the conducting and the respiratory portoins of the respiratory system. The alveolar ducts are continuatoins of the respiratory bronchioles. They terminate in alveolar sacs which are made up of clusters of aveoli, the acual sites of gas exchange.


Trachea

The Trachea is a flexible tube which decends from the larynx and divides into 2 primary bronchi. This air passageway continues to filter, warm and moisten the inspired air as it travels through to the respiratory zone.

Larynx

The larynx links the pharynx to the Trachea. The princable 2 functoins of the larynx are to act as an open, conducting airway , and to provide a swiching mechanism to direct food and air into the oesophagus and the trachea respectively. The other role of the larynx is associated with its alternative name of the "voice box". the larynx cantains the vocal cords and is the enssential voice.