the respiratory system moves air through the nose,pharynx,larynx,trachea and bronchus to the alveoli while the gas exchange between oxygen and carbon dioxide occurs.Mayors are the openings to the nose,the nasal cavity is lined with Cilia,mucous membranes and blood capillaries.The air is filtered by Cilia,moistened by mucous membranes and warmed by the blood.Air moves into the pharynx or throat,the common passageway for food and air,air continues on to the larynx.The epiglottis a flap of tissue in front of the larynx closes of the larynx when swallowing to prevent food from entering.The larynx or voice box contains the vocal folds,the trachea or windpipe connects the lyrics to the bronchiole tree,the cartilage rings at the trachea prevent the trachea collapsing.Lawns are spongy tissue alveoli and blood capillaries.Breeding occurs because of the expansion and contraction of the lungs.The bronchi carrying the air subdivide into smaller branches call bronchiole.At the end of each bronchiole are alveolar sacs.The alveolar sacs surrounded by blood capillaries and contain millions of single layer alveoli cells with the gas exchange takes place.Oxygenated air goes from the nose to the pharynx,larynx,trachea,bronchus and alveoli by the process of a fusion.Oxygen in the air moves in alveoli to the capillaries,carbon dioxide moves i. the capillaries to the alveoli and is exited.This process is call respiration.
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