What are the three types of bronchodilators, and how do they function to alleviate the symptoms of COPD?

What are the three types of bronchodilators, and how do they function to alleviate the symptoms of COPD? What are other possible treatments for COPD?
Also, note that content in this case scenario incorporates topics from Chapter 22
1-2 references to support your responses.
1-2 full paragraph responses to two peers

BOOK
Pathophysiology 6TH 19
Author: Banasik, Jacquelyn L. / Copstead, Lee-Ellen C.
Publisher: W.B. Saunders Co.

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