Summarize three of the subsections within section 6.5.1. Why did you choose the three subsections you summarized? What was most significant about their content? The authors indicate a mean volume of 4.2x106 pm3 for a single alveolus. Please verify (or disprove) this number, using another source (and provide the reference). If the mean volume of 4.2x106 pm3 is correct, and the volume can be approximated in the shape of a cube, what is the length of the side of the cube? 

Your response must be at least 300 words in length.
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