• Classify respiratory tract diseases, their causes, and the pattern of associated symptoms.
• How are infections of upper respiratory tract different from those of lower respiratory tract?
• Why are infections of the upper respiratory tract milder as compared to those pertaining to the lower respiratory tract?
• Describe the curative methods for each of upper and lower respiratory tract infections.
• What are three specific factors of the immune system that help to clear the lower lung of infectious agents?

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