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The respiratory system role is to provide oxygen to the blood and expel the body of waste gas, consisting mostly of carbon dioxide. The structures of the respiratory system are associated with sensory organs of smell and taste (in the nasal cavity and the mouth) and the digestive system (of the oral cavity to the pharynx).

Respiratory organs separate from others at the level of the pharynx and become the respiratory tract, consisting of the larynx, the trachea and bronchi.

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The respiratory system
The bronchi are the number two and leave the lower end of the trachea, at the level of the tracheal bifurcation, to then enter the hilum of the left and right lungs.The lungs contain finer ducts, or bronchioles, responsible for transport air to the functional unit of the lungs: the Chamber.

There, in thousands of tiny cellular rooms that contain the lungs, the oxygen provided by the inspiration crosses the membrane of the alveolar walls to be transferred to red blood cells in capillaries. Conversely, waste gases pass red blood cell air to the alveoli, to be removed by the expiration.

Diaphragm, broad, thin muscle under the lungs, ensures with intercostal and abdominal, muscles contraction and expansion of the rib cage to respiration.Sides serve as structural support to the totality of the chest, and the pleura membranes ensure the lubrication of the respiratory organs, avoiding friction during breathing.

The lungs
These organs spongy, large, conical, are your lungs. They play a vital role since they are responsible for the supply of oxygen in your body. Oxygen allows the body to burn its fuel, i.e. the nutrients contained in food.

The lungs are divided into two halves, right and left. The right lung has three lobes, while the left has two and has a slot for the heart. The lungs of an adult can hold about three litres of air. Because the lungs have no muscles themselves, are the chest muscles that are responsible for the work of breathing. The majority of this work is ensured by a thin muscle located at the base of the lungs and called the diaphragm.

Respiration is automatic, present even when one is unconscious. At rest, the respiratory rate of an average adult is 16 breaths per minute. The air we inspire descends into the trachea to the bronchi, which branch out into right or left lung.

The bronchi themselves branch out into several bronchioles, which are divided into half a dozen of alveolar ducts, which are narrow led in sacs. This branched structure between the trachea, the bronchi, the bronchioles, alveolar ducts and sacs is often called “bronchial tree” because of its resemblance to the branches and the leaves from a deciduous tree.