Due tomorrow please help

Step 1 Explain three difficult concepts.As you review the activities and 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 SystemMechanics of BreathingRespirationStep 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.  Your response should be a  500-word paper.