Explain the structural and functional aspects of the alveolus and bronchus and how they work together in the respiratory system.

.  Explain the structural and functional aspects of the alveolus and bronchus and how they work together in the respiratory system.  Identify at least two diseases that can affect these structures.

Response should be at least 200 words in length.  All sources used, including the textbook must be referenced; paraphrased and quoted material must have accompanying citations.