Respiratory System Anatomy and PhysiologyObjectives Identify the anatomical structures of the respiratory system and their functions Explain the mechanics of breathing Explain internal and external respirationAssignment OverviewThis practice exercise helps students understand the anatomical structures of the respiratory system.DeliverablesA one- to two-page (250- to 500-word) paperStep 1  Explain three difficult concepts. As you review the information presented in this lesson and the textbook, identify the three most difficult concepts (or parts of a concept) in respiratory anatomy and respiration for most anatomy and physiology students. Select one difficult concept from each of these topic areas: Anatomy of the Respiratory System Mechanics of Breathing RespirationStep 2  Write an explanation of each concept. Write a clear one-paragraph explanation of each of these three concepts. Use images from the Internet or those that you scan into the document, if possible. At a minimum, submit a one- to two-page (250- to 500-word) paper.Step 3  Save and submit your assignment. When you have completed the assignment, save a copy for yourself in an easily accessible place and submit a copy to your instructor using the dropbox.