What are the pathogens and how may they influence the respiratory system of a human?

Asked on 21.10.2018 in All Questions.
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It is estimated that there are around 150 million alveoli in each lung that provide a large surface area for gaseous exchange to occur. The walls of the alveoli are extremely thin and are made up of a single layer of squamous epithelial cells; these cells produce alveolar fluid which keeps the walls moist so that the gases are dissolved before diffusing. Surrounding the alveoli sacs, are a network of pulmonary capillaries that together form an extremely thin membrane, this...
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