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the mechanical movement of air into and out of the lungs

external respiration

exchange of gases between the atmosphere and blood

internal respiration

exchange of gases between the blood and the cells of the body


a long tube lined with rings of cartilage, also called the windpipe,


either of the two main branches of the trachea, two short branches located at the lower end of the trachea that carry air into the lungs.


small branches of the bronchi that are dead ends with tiny air sacks called alveoli at the end


main organs of the respiratory system, where gas exchange takes place


air sac at the end of bronchiole where O2 and CO2 are exchanged from capillaries


A serious condition where the bronchioles in the lungs become narrowed and make breathing difficult


Inflammation of the bronchial tubes, which causes coughing and mucus production


infection of lung when alveoli becomes filled with fluid


disease in which the tissues of the lungs lose elasticity, making breathing very difficult

lung cancer

a lung disease in which cells in the lungs grow out of control

tidal volume

amount of air you move into or out of your lungs during a single respiratory cycle.

inspiration reserve volume

forced inspiration after a relaxed inspiration (3100 ml)

expiration reserve volume

forced exhalation at the end of a tidal cycle

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