The main genera of normal biota presently known to occupy the respiratory tract. Concept introduction: There are a variety of organisms which infect the respiratory tract. These include species of bacteria which grow on the layer of respiratory tract cells and destroy them. It causes formation of mucus and secretions.

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Chapter 21.2, Problem 3AYP

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The main genera of normal biota presently known to occupy the respiratory tract.

Concept introduction:

There are a variety of organisms which infect the respiratory tract. These include species of bacteria which grow on the layer of respiratory tract cells and destroy them. It causes formation of mucus and secretions.

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