JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Lower respiratory tract infection. Artwork of a lung in a human figure, showing the processes involved in a lower respiratory tract infection (LRTI) such as chronic bronchitis. In bronchial inflammation (bronchitis), the airways of the lungs (bronchi) respond to an infection by becoming inflamed and producing mucus that is coughed up as sputum (phlegm, yellow). The production of this mucus is shown at a cellular level in the inset (circular). Bronchitis also causes shortness of breath because the airways become narrowed. It is associated with both smoking and air pollution. There is no cure and the functioning of the lungs steadily becomes reduced.
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